My home theater system has a $20 thrift store stereo coupled with $20 thrift store speakers. It's equipment that would have cost maybe $500 new. I also pickup up monitors, keyboards, mice, cables, and power strips there. Mostly what I get there are books. I like books, and it's a cheap hobby when you get 'em from the thrift store.

From the pawn shop I get laptops and webcams. Also lots of tools. I put together a toolkit for my car this way - cheap tools aren't a theft target.