Bestbuy offers WD - BLACK SN850X 4TB Internal SSD PCIe Gen 4 x4 NVMe for $259.99 (orig. $369.99) with free shipping.

Product Description:
Strap in for breakneck gaming speeds with the WD_BLACK SN850X NVMe internal SSD. Crush load times and slash throttling, lagging, and model pop-ins for a smooth, fast experience that lets you compete at your absolute peak. This purpose-built gaming drive comes in the capacity of 4TB. With the advanced features of Game Mode 2.0 (Windows only) plus speeds that approach the limits of the PCIe Gen43 interface, the WD_BLACK SN850X NVMe SSD delivers top-tier performance to keep you playing, streaming, recording, and dominating the game. 

• PCIe Gen 4 x4 (NVMe) interface
  Offers simple connection to your computer.
• 4TB storage capacity
  Provides ample storage space for your music, movies and other files.
• Reach high performance
  The NVMe technology delivers up to 7300MB/sec. data transfer rate speed for a smooth, responsive and powerful gaming experience.
• Limited warranty
  This WD_BLACK SN850X SSD comes with a 5-year warranty.
• Game Mode 2.0 technology
  Includes performance-boosting features, such as load prediction to ready game assets for fast in-game loading.