YMMV on this. Went to a local walmart to see about the Crucial 500gb external SSD, but they were out. Looked around and found these for $11.47. Reviews are actually pretty decent, and it looks like it contains an actual mSATA inside if you wanted to crack it and use it as an internal drive.
Brickseek didn't show them in stock at all at the store I was in, but here's the BS link anyway: https://brickseek.com/walmart-inv...=224316039