I recall having seen one come up on eBay a few years ago. I briefly pondered buying it for my LWP630, but the shipping made it expensive, and the printer as it is really has enough paper capacity for my needs. I also seem to recall reading at the time that OSX has problems printing to the LWP630 with the 500-sheet feeder installed, but as that is a fairly distant recollection, take it with a grain of salt. As my wife would happily tell you, I am often wrong.