Adata via Amazon offers its Adata SD600 256GB 3D NAND USB 3.1 External SSD in Rugged Black or Rugged Red for $49.99 with free shipping. That's $8 under our September mention and the lowest price we could find by $29. It weighs just 3 oz. and features read speeds up to 440MB/s, write speeds up to 430MB/s, and AES 256-bit encryption.

Note: The 512GB version is also available for $79.99 with free shipping. That's the best deal we could find by $41. (It's expected to be in stock by April 6.)