For cover scans I've been using Graham Marsh and Glyn Callingham's Blue Note Cover Art book and my scanner. Sure, there's a few covers that aren't represented, but not many. Here it is at Amazon: click The really small ones need to be scanned around 150% and resized a bit in photoshop, but they look swell.
And as the original topic goes, I've got Boss Horn, It Might as Well Be Spring, Cliff Jordan, Turning Point, Like Someone in Love, True Blue, Little Johnny C... I think that's it. Two from the remarkably efficient and reasonably priced EJazzlines, the rest from an eBay seller called spanichi, whom I purchased from directly after losing an auction. They are ugly little blue things, but they sound swell and they're a bargain. I just wish I hadn't bought the Toshiba Up & Down before I discovered them!