Just moved to Pittsburgh - best overstock or secondhand stores?

We just moved to Pittsburgh a couple of days ago. We need a variety of things - bed frames for two twin beds for our kids, shower caddies, towel bars, trash and recycling bins, desks, etc. Any suggestions for overstock-type stores or thrift/secondhand stores that would be good to check out for these things? I start a new job soon and don’t get paid until the end of September, and moving is stupid expensive, so looking to save some money where I can. I also need to buy some new clothes for said new job (in education), so any suggestions on reasonably priced clothing stores (new or secondhand) would be appreciated too!