Was just able to pick up a couple of Intel S1400FP2 LGA1356 ATX motherboards for 160$ each though you could probably put in a lower offer as at 160$ the offer was accepted right away
Intel DBS1400FP2 S1400FP2 Server Board 4U Socket B2 SSI ATX DDR3 New Retail Box 0735858246668 | eBay
These are for Intel E5 1400/2400 cpus including the V2 versions
have 6 DDR3 dimm slots
8 onboard SAS ports and 6 SATA ports
Intel DBS1400FP2 S1400FP2 Server Board 4U Socket B2 SSI ATX DDR3 New Retail Box 0735858246668 | eBay
These are for Intel E5 1400/2400 cpus including the V2 versions
have 6 DDR3 dimm slots
8 onboard SAS ports and 6 SATA ports