It's an unusual trend that I frankly can't explain. I might understand selling for close to the original retail price (especially the 980H), but I recently decided to sell off my 981HD on Amazon.com Marketplace because it was not being used and I was able to sell it for $299 (about $70 more than the original price).

The 983H selling for full retail or more I can almost understand - it's a really good universal DVD player and can be made region-free in a few seconds with just the remote control. The 980H and 981HD are good players, but neither was quite as remarkable as the 983H (the 981HD uses the Faroudja chip, which was starting to be a bit old when OPPO started offering players with it about five years ago, and the 980H uses the Mediatek chip for scaling and deinterlacing duties). Both can also be made region-free, both have proven pretty reliable, and both have been well-supported by OPPO Digital over the years. I suspect some of it has to do with the popularity of the BDP-83, but I really can't explain it.