One of the cheapest I have seen.
Samsung 840 Pro 256 GB OEM 2 5" MZ 7PD256M SSD Solid State Drive New 887276001173 | eBay
Much cheaper than the 850 pro
Samsung 840 Pro 256 GB OEM 2 5" MZ 7PD256M SSD Solid State Drive New 887276001173 | eBay
Much cheaper than the 850 pro