6. Don't second-guess yourself; trust your instincts.
Taking advantage of fantastic offers when you see them is one of the best ways to save money at a secondhand store. The parts of thrift shopping that I regret the most were when I didn't take advantage of a good deal. Despite my instincts telling me it was a fantastic offer, I hesitated and decided to return later. That object was always gone by the time I returned to it.
It's sometimes a good idea to trust your instincts and go ahead and buy something. (Unless you have a problem with hoarding or shopping addiction.) Unlike conventional stores, thrift stores usually only have one item in stock at a time, and once it's gone, it's gone forever. If you change your mind about a purchase, you may always return it or sell it later on the internet. The majority of products you'll find at a thrift store are under $10.
