Mary Kay and Avon (and Pampered Chef, Tupperware, and every other item you don't buy in the store that people throw "parties" for).
I think eBay is a great idea. Buy something for a bargain or regular price if it's in demand, and then set your price on eBay. It's going on right now with the Missoni for Target stuff. I think I could do that. Except I'm lazy. And maybe a small part of me feels bad jacking up the price of something well beyond what is on the tag (yes, I know, finder's fee and people are willing to pay). But mostly I'm lazy.