Kudos to Powell's, I've spent literally thousands of dollars over the years at that magnificent store and will continue to do so; spent hour upon hour there in my childhood getting lost in wonders it holds.
They don't try to undercut smaller bookstores by offering discounts on new books like B&N, Amazon, etc., their employees seem to actually enjoy working there, it's a family-friendly environment and the selection simply can't be beat. If you enjoy reading, please support this business.