Amazon has the Toshiba OCZ RD400 512GB PCIe NVMe SSD (RVD400-22280-512G) on sale today for $209.99. Shipping is free.
Toshiba OCZ RD400 Series Solid State Drive PCIe NVMe M.2 512GB with MLC Flash (RVD400-M22280-512G)
Here's our review of the 512GB version of the Toshiba OCZ RD400: http://www.cdrlabs.com/reviews/toshiba- ... drive.html