I feel like the Exchange in squirrel hill has been around forever, and I'm happy about it. "Buy, sell, trade" really sums up exactly what they do. They have wall after wall of cds, movies and games, and everything is really affordable! There's an entire section of $1 movies, which I absolutely love.
The workers are always nice and informative and ask if you need help a lot (which you will..everything in the store is locked up behind cases!). They also have a rewards card and sometimes have specials through it. Also, a birthday month discount! Used is awesome as long as everything works, and I have never had a problem from anything at the Exchange! I recommend.