Hi icepak,
Welcome to HW.
Yes, it is an outrageous scam that TENS units are being marked up into the hundreds or even thousands of dollars, for the exact units we can buy for $40.
In addition to the Santa Medical, I've also found:
www.amazon.com/Resealable-Packs-Electrodes-Each-Total/dp/B00BISIHJ4/ref=sr_1_44?ie=UTF8&qid=1379517291&sr=8-44&keywords=tens+padsWhich are a bit cheaper and better quality - than the Santa. I just looked at the Bioflex -- about
twice the price. I'm not sure if they are any more conductive, but I wonder if the Silver might help with skin irritation.