Amazon has Lexar 512GB Portable Solid State Drive SSD (LRWSSD512TBNA) for $145
There are couple different sellers that selling it in the same proce more or less.
Shipping is free w/ Prime or if you spend $25 or more.
I recently purchased it and I really enjoy it, super fast.
https://www.amazon.com/gp/product…QD2I3
Product Highlights:
SSD-level performance—up to 450MB/s read and 245MB/s write speeds*
Sleek, compact design
Available in 256GB and 512GB capacity options
LED capacity meter displays available storage space
Great for use with Lexar Professional Workflow line products