I've been out of serious Durant collecting for a few months, but I know when I was rolling, I wouldn't have paid anywhere near $3500 for that one. I'd rather have the base /99 (even with a 1-color), Number Pieces, Autograph Patches, and Limited Logos than that card.
When I post a price, I will not respond if you ask for a "best price" of if I "can do any better." If you want a better price than the one posted, please counter-offer.
My SportsCardAlbum: http://sportscardalbum.com/u/gamboooler