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Amazon has the Plextor M8Pe 512GB M.2 PCIe NVMe SSD (PX-512M8PeG) on sale for $249.99. Shipping is free.

Plextor M8Pe 512GB M.2 PCIe NVMe Solid-State Drive with Heatsink (PX-512M8PeG)

Amazon has the entire M8Pe series on sale. Capacities range from 128GB up to 1TB. The drives are available with or without a heatsink. You can also get them on a half-height PCIe card with a massive, light up heatsink.

Plextor M8Pe M.2 PCIe NVMe Solid-State Drives