What Mike said... Unclesash posted a while back that he wasn't selling them anymore and liquidated his parts inventory. $200 is a really great deal for one of these. I started to price out building my own and without the frame costs for a single unit were coming in around $190. I bumped my quantities up to build 5 and the costs come down to about $150 per unit but again that is without a frame.
Here is the shopping list I've created if anyone wants to leverage that to build some (It could be missing things, I never ended up following through):