Looks like another person who is getting out of Bitcoin mining and getting into GPU mining.
Your best bet is to just buy them locally on Craiglists. It will be too expensive here or on eBay. Also avoid the 290x, it overheats and runs too hot. Stick with the 7970/280x.
I will continue bitcoin mining just trying to diversify. The mining scene for bitcoin is going fast. Even the deals here on marketplace are great deals but with the difficulty skyrocketing so fast they won't ROI for almost a year now at current rates.