There are also shopping apps like ibotta, MobiSave, and checkout 21 that give you money back for shopping. And the Walmart app has a savings catcher feature where you take a picture of the barcode or upc at the bottom of your receipt and they search all surrounding store and if a lower price is found they give you the difference back. I have made about 50 bucks total from this app and 20-30 from things like ibotta.
Having your own site to sell gently used handbags is probably going to be a really, really difficult endeavor for what its worth. It will be hard to get enough eyeballs/visitors on those bags to generate enough sales to make you any meaningful income (it’s an incredibly small niche and almost too specific in nature). Not to deter you from the idea completely but you’ll need to commit to several years of patience to really hit a home run in that field.
What’s the catch? None, really. Cash back apps act as affiliates for many online merchants, which means that whenever you make a purchase through one of the apps, they get a small commission — but then, they give you a portion of that commission as “cash back”. For example, if I buy a pair of Nike shoes through the Ebates app (or website) and spend $75, Ebates may get a $10 commission but then they’ll pass $7 back to me. It’s basically a way to get sale prices on stuff that isn’t on sale!