They'll show up as a "Used" product if you click on the "New & Used ... From XXX" link on a product page (this link moves and changes based on the product and what's available). For example, Amazon Warehouse has a Truxedo TruXport 6.4ft bed cover for $136. They list this one as having "large cosmetic imperfections". I've had really good luck with Amazon Warehouse deals in the past, I ordered a wifi router once with that same "Used - Acceptable" rating and it was in like new condition. Its a crapshoot but you can return it if its not to your liking. You don't need Prime to buy these things, but I think you need Prime for the free returns part of it (not sure on that). The warehouse deals are generally products that have been purchased and returned to Amazon and have damaged packaging or damaged/missing parts, so you can find some really good deals sometimes.
FYI the Pro X15 cover I ordered was listed as "Used - Good" and the description said its missing hardware. I figure as long as the cover itself is in good shape I can just buy bolts from the hardware store or order brackets from Truxedo depending on what's missing. The main thing I'm giving up on it is the warranty, since it's sold as used that gives Truxedo a reason to deny the warranty on it. I would rather have the warranty, but historically I've made very very few claims on stuff like this, and generally you have to pay to ship it back out of pocket with these warranties too. Shipping stopped me from doing a warranty claim on my old Iron Cross running boards that the finish came off of cause I'd have to pay an arm and a leg to ship them back for repair and hope it doesn't do it again.
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