Just picked up one of the 240GB SLC ones for a cheap ZIL. Seems like a decent deal.
http://www.ebay.com/itm/STEC-S1120E240S4S-SLC-PCIe-Accelerator-SSA-240GB-EnhanceIO-SSD-KI04A04A-240/252616108669
STEC S1120E480M4S 480GB PCIe Accelerator SSA 480GB + EnhanceIO SSD KI04A04A-480 | eBay
STEC S1120E980M4S 980GB PCIe Accelerator SSA 980GB + EnhanceIO SSD KI04A04A-980 | eBay
http://www.ebay.com/itm/STEC-S1120E240S4S-SLC-PCIe-Accelerator-SSA-240GB-EnhanceIO-SSD-KI04A04A-240/252616108669
STEC S1120E480M4S 480GB PCIe Accelerator SSA 480GB + EnhanceIO SSD KI04A04A-480 | eBay
STEC S1120E980M4S 980GB PCIe Accelerator SSA 980GB + EnhanceIO SSD KI04A04A-980 | eBay