If you're good at looking and are persistent you can find old, good boards. I've seen a few diamond in the roughs for 75$ when looking for X79. It's all about persistence and looking EVERYWHERE. I bought a brand new MSI P67-GD55 B3 today off ebay for 25$! 25 BUCKS.
You have all this high end hardware, didn't buy a res, and didn't plan this out right? This is all kinds of fucked up. Stop doing what you're doing and buy a res before anything goes wrong.