Supermicro 1U Server X9SCI-LN4F Barebones (Add Your CPU / Memory / Hard Drives) | eBay
LGA1155 machines are getting pretty inexpensive, this includes the 1U chassis, HSF, PSU, 4 caddies, + mobo. You can't throw a ton of cores in it to make a hyper-converged server, but Sandy/Ivy Bridge 1155...