Well, this thread is evil because instead of going in and ONLY getting my Biotera gel I also got:
GVP conditioning balm
And thanks to a thread on nail polish in the general discussion forum I also got a buffer and some buffing cream.
My Sally's must have is the Biotera gel. I've been using it for years, the price is awesome and I love that I can get it in the liter size and refill my smaller bottle, especially when they have it on sale.