"GSA has a good selection of specialty books you won't find anywhere else, and their pricing (particularly on older [5-8 years] books) is good, especially if you use the occasional coupon they put out for GSA members. Handling is a tad slow (and they don't seem to notify you of shipping), but all of my items arrived. It was certainly worth the wait. I had to interact with customer service due to a website technical issue during checkout, and they responded within a day (the problem was resolved and hasn't recurred since)."