eBay with szhdd has the WD SN740 2TB M.2 2230 NVMe PCIe4x4 Solid State Drive (SDDPTQE-2T00) for $182 - 20% off with coupon code DEALTWENTY [Exp 6/11] = $146 with free shipping. Has up to 5150 MB/s sequential read speed, and up to 4850 MB/s sequential write speed.