They are out of stock right now, but $84 USD isn't bad.. especially if you are on a tight budget. And if I may say, with NS being as awesome as it is, the small atom cpu and 4 gig ram works just fine as a firewall and in my case firewall and NAS. With full load of 6-10 users. Just to test it out I set a 50 gig file to transfer to the NAS, set 2 users to stream 720p, had one user stream 1080p, and there were two others browsing I was still able to consistently pull around 20 mbps speed testing, the cpu didn't rise above 60% use and the ram never touched the swap space.
@robb, I had originally setup the way that you described and it worked good. However, I found out during a couple of power outages when the server had to hard shut down that I would have to manually restart the firewall. While digging in looking for solutions I was offered the Supermicro box for free, so this setup became the solution. The budget for this was free only, there wasn't any money that could be re-allocated. So instead of trying to manipulate the hypervisor I deployed the supermicro box as a dedicated firewall. If/when I get the hypervisor to behave correctly in the event of a hard shutdown then that's great, but in the mean time the supermicro box will automatically come back online allowing me to vpn in and manually restart the vm's if need be.