I love these stores! You can't always find the really hot bestsellers here, but if you are a book lover you can spend hours at any one of the Half Price Books locations. They have everything from classics to modern lit, tons of reference and non-fiction materials, a nice selection of gift ware and even software.
The one on Brown Deer also does a lot of periodicals and music as well as some collectible books. I have picked up a few cute old Betty Crocker cookbooks to display in the kitchen just for a vintage touch.
The only drawback is that unlike the big box chains, every book in the store is NOT in a searchable computer program. If you are looking for something particular, you might not find it easily and though the staff is always helpful, sometimes they can't find it either. You just have to keep that in mind when you see the great prices!