While looking to buy a new SD card at Roseville Fry's, I stumble upon this deal that I could not refuse. A mSATA 500GB (840 EVO) for 100 bucks, well below the normal price of a SSD drive of that size. Without looking at the fine print, I got the invoice, but was not informed by the associate that it was used, only that it was a discontinued item.
Upon going to the register to buy, it was actually returned. Twice. I decided to back out, since I do not have much trust in returned items when they are used for critical systems.
They said that it has been tested and it works fine, and I doubt that they were returned for any reason other than not being the right SSD type for their laptops or as an expansion (mSATA SSD uses different plus than a standard SSD, and you cannot plug in SATA connectors). They still come with a 30 day return policy, so you have a good deal if it's being used as part of a redundant backup and/or you don't mind losing the stuff on it any time.