I prefer Salvation Army-type stores. Out here in CA, the pickings are amazing. I got a pair of For All Mankind Jeans for $15. NO WAY!
And when we were in Gtmo Bay, in the FedEx storefront, the Jamaican guy working the desk had a confederate bow-front dresser just sitting in the corner. It was the shorter version, I already own the taller dresser. I eyed it for about two months & finally asked if they were using it at all. They weren't, and he gave it to me for $20!!! Now we have a matched set of real-deal bowfront dressers in our bedroom.
A coworker is heavy into the garage sales! She buys there, cleans and repackages, then resells at the flea markets.
If I'm on the hunt for something in particular, I'll give her a headsup and she'll keep her eye out. Otherwise I avoid them like the plague. Too much temptation too spend $$ on clutter as we have all we need.