(This is based on one purchase.)
I recently stumbled on ThredUp from an ad on an article I was reading. I'd never heard of them before, but I knew I was looking for a black leather crossbody bag to replace my well-loved and worn out The Sak purse I'd been using for years.
I was really careful defining my search parameters and only looked at bags with excellent reviews. I didn't want to pay over $45 in case I was really unhappy with the experience.
I eventually settled on a Cole Hann bag with an original price of $250 that was listing for $36.50. The purse arrived two days ago and after a close inspection, I am VERY happy with it. There are no obvious defects to the leather. There is an issue with the zipper, but I've had the same issue in other bags and it's not really a problem.
So I will shop there again. I'll probably limit it to accessories since I can't imagine trying to get clothes online since I can be very hard to fit, but for certain items, this place is a gold mine.