You can sometimes get China Glaze for a little cheaper from Sally or Amazon, but not all the colors, so it's worth looking here if there is something you've had your eye on. The Safari, Kicks, and Hunger Games collections are here, among many others. I don't think I've seen the Nicole polishes anywhere for this price, but correct me if I'm wrong. The BTR options include polishes that were CVS exclusives.
You need an account to browse BTR - here is my invite link, if you'd like to use it.
Anything there tempting you?
(I've talked about BTR selling counterfeit MAC before, but I don't think that's a concern here. MAC counterfeits are a particular, more widespread problem.)