Grab Samsung's 500GB T5 SSD for $80 at Best Buy | Engadget
Samsung Portable Solid State Drive T5 1tb - Original Samsung T5 2tb 1tb 500gb - Aliexpress
Just bought the Samsung T5 500GB SSD and ran some speed tests against the PS4 slim HDD. Not scientific by any means but got some some interesting results. See comment below. Btw