I am just curious about this subject as well and so I've look around a bit and found this:
The first is from www.bwgen.com. The software is shareware, so first month is free. And something like $40 to register.
This latter site has freeware to make your own.
http://vhypno.sourceforge.net...
Try the South Beach Diet bars if you can find them. From Memory 19g protein, 6g fat, and about 6 net carbs. They use soy protein in a crunch type of manner (kind of like a Nestle Crunch bar) and a layer of chocolate on the bottom. The two flavors I like are chocolate and peanut butter crunch...
I was not suggesting to order them online. The company has a list of local hardware stores which carry them. Find your favorite store and go. But yes I have seen them at HomeDepot in the electrical isle as well. They were orange, I guess one could have guessed that.
If you are really interested here are a few links to TENS and electrostimming in general: www.eroticelectrostimmag.com and http://gocs1.com/Psionics/TENS-schematic.zip
I found the second link on the prior web site. They have links to other sites which deal in electrostimming as well.