I went here because this is one of the few places that carries psi bands without preordering them. I was actually very surprised by this store as I had never been in an REI before. They have a whole lot more than just "camping supplies". Prices are more affordable than I originally thought. And you don't have to be a member to shop here (only online). However, the associate made the co-op membership sound real enticing. Things to consider...
This particular location is decently sized for it to be located in South Side. Parking can be a hassle dependent on when you go. But you're also conveniently surrounded by multiple parking garages and restaurants.