Crazy. The time has come. You can get a 36v20AH lifepo4 now for $312 from elitepowersolutions.com
That's where I bought my cells. I'm going to order some more and I thought I'd pass it on. I can't believe how cheap they are now. It's so cheap because they lowered their prices and they got free shipping on all online orders. That's what it says on the front page.
If you've been waiting to get lithium, now is the time !!