Bought a good condition, used,  ASUS ROG R9-280X Matrix Platinum for $50 Canadian Pesos.

Owner thought the card is defective, saying it artifacts -- really just ASUS' design flaw for not cooling 4 of 8 VRAM ICs that are running beyond Hynix's rated specs.

Little copper heatsink mod, and boom, even better than new!

Good spare card, or even just as a show piece