GPU for hobby projects

I was wondering if there were any GPGPU packages available at all for the hobbyist? I mean the Tegra K1 system exists and that's cool and all but beyond the eval kit I can't imagine I'll be able to buy like.. 10 of them for less than a ton of money. Even beyond that it's not like I feel like I could design a PCB for the K1 and reliably mount it without advanced equipment (e.g. more than a reflow oven).

The advancement in mobile computing graphics has been pretty rapid so I am just wondering if anything is available that isn't coming up on digikey. If you need an example case for my frame of reference I was thinking about working with computer vision problems which naturally lend itself to the GPGPU's strengths. This is a fishing expedition more than anything.