A number have subs have inquired what electric toys they might buy for themselves to do internal electric play.
These toys would be yours to keep and only be used on you since they cannot be sterilized.
Below are the homesites of all the electrical toys mentioned here.
In most cases direct links to specfic toys are available in the descriptions.

Folsom website lists all the toys they make, but they are not sold on the site itself.
Extreme Restraints (home page) carries about the best selection of electric toys and adapters.
Rupert Huse & Son: A variety of electric toys not found elsewhere including there own butt plugs.
The Stockroom (electrical homepage) has a also has a good selection of electric toys.
PES also has a wide selection of there own brand of toys, some quite unique.
Sextek is also a good place to get some unique electrical toys.

The links below go directly to the product mentioned. Please let me know if the links go to wrong place.
Also, try just going to the home site and looking for the product manually.
Make sure that with anything you buy that you purchase proper adapters for the Eros Tek Unit if needed.
Some information may be repeated here or throughout the site.
This is just done so you can read a single page and understand why certain toys work and others might not.

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DISCLAIMER

All reviews and information on this site are my personal opinions based on my own experience.
I a not responsible for your satisfaction or dissatisfaction with any products mentioned.
No recommendations, endorsements or instructions are implied. I am not responsible for any use or misuse of the products and descriptions contained here or any injuries that might result from your use of the products and techniques mentioned. At times I may mention use above the waist. This is generally considered an unsafe practice even though some toys will specifically say that this is okay. Regardless, you always do so at your own risk. Make certain you always have an experienced person to teach you the basics and guide through each process safely. As always, it is important to keep play safe, sane & consensual.

BUTT PLUGS

Electric butt plugs are great because they can give you the sensations of being fucked in the ass. They are my favorite electric toys. I suggest the Folsom MINI Electric Butt Plug (FP850) - I know it doesn't list this directly as a Folsom item, but it looks identical to the one I have. This plug is small & lightweight. It is quite suitable for beginners to anal play. The other plugs both small and large are quite a bit bigger and because the material is hard & not soft like traditional butt plugs they are more difficult to get in. It costs about $150. Click here to see it reviewed. Locally, at Body Language I have not seen the MINI Folsom plugs I recommend. However, online they do list the small & large plugs, so you may want to give them a call and see what they have if you are in rush or don't want them shipped to you. You can have any kind of toys shipped directly to me if you are afraid of someone in your home finding out about them, though most places that ship do so in plain packaging with a discrete corporate name such as XR. LLC from Extreme Restraints where this item is currently available.

There many different butt plugs out there and I have tried few different kinds. None of them seemed to work well. While the Folsom ones above are about the most expensive, if you buy one, you can be sure it will work properly. Trying to save money on this could actually end up costing you more or even turning you off to whole experience. Having said this, I have looked at a variety of plugs attempting to find something less expensive that would still work or just other plugs that look as good and even possibly better made and more pleasurable. No matter what you all ready have or choose to buy, it is important to make certain you get adapters for the Eros-Tek units if the product is not directly compatible.

Whatever you do don't buy a unipolar butt plug. Uni-polar toys need to almost identical in conductive area in order for you to feel both toys. Though I have some unipolar toys, most people don't enjoy there use nearly as much as the bipolar toys I have. Most of the unipolar toys I have tried using are hard to get to work properly. You can usually get sensation in one of the two unipolar toys by putting a large piece of foil under your bottom. There are a few things that do seems to work well unipolar well such as knives and sounds, but that is because you only need sensation in one toy.

From Extreme Restraints there are the Silicone Electrosex Plugs (about $50 - $60, read reviews) and the Electro Dual Contact Mini Probe (about $80 & the smallest for the tightest / most virgin bottoms). The White Electrosex Probe might work too, but it's design is more dissimilar than the others. They also carry several bipolar steel plugs. I have a friend who very familiar with electricity. Though he doesn't have one, but says this kind may actually be better than the ones with smaller contact areas.

Sextek also carries Bipolar Butt Plugs that have a greater surface area and again look better made than the Folsom plug; they are the same price too.

Rupert and Huse carry there own brand of butt plugs that they claim are better made and look more similar to Folsom one. Huse Electro Sex Plugs are more expensive, but if I had to pick a one it I would definitely go with 3 Conductor Straight Plug.

BUTT PLUG and OTHER INTERNAL TOYS from PES

PES (Paradise Electric Sex) also carries there own line or a variety of butt plug styles. The Acrylics look very similar the the Folsom ones, so there is a good likelihood that they will work well, but can't see much a reason to buy them instead, as they are the same price. I have tired using the anal tubular device and despite repeated tries could not get it to work. They have some interesting looking plugs called Electro-flex Plugs. However, having no experience with anything quite like it, so I would be especially wary about purchasing it.

I have also used their electric box, which, no matter what they say, isn't much more than a very expensive tens unit. Every person I have meet who has tried either the PES or Folsom unit greatly prefers either my standard and/or remote controlled Eros-Tek boxes. Basically, there overall opinion is that there is little variety in the others and it gets boring fast.

URETHRAL TOYS

My favorite are the Flat End Sounds (b242) sold by The Stockroom. The Stockroom also carries other sound sets that look just fine as well. Not being male, I'm really not sure what the difference in sensation between them are. They are great for inserting into the penis hole. They are not electrical toy per se, but I have the tools to easily make them electrical. They run about $80 - $100. Click here to see it reviewed.

I have also used the PES Corona "Cockhead" Stimulator with Urethral Amplifier. It costs about $80. The sub I had said that he enjoyed it. However, from experience I think it would be wrong to recommend it, as there are issues with this and other toys like it. The main issue is that different guys have different sized cock and some subs will stay hard, while other remain flaccid. This creates problems with the devices not fitting right and is turn not making a good connection. Click here to see it reviewed. Again other toys you buy, I can use. These are just my favorites. PES carries a variety of electrical urethral cock toys including a newer one called the Deep Throat that most definitely intrigues me.