LA Computer Company offers the LaCie 256GB Rugged Portable External SSD
, model no. 9000352, for an in-cart price of $295
for shipping. That's $1.19/GB and the lowest total price we could find by $8. (Most places charge $340 or more.) Features include a Thunderbolt port, USB 3.0 port, and up to 385MB/s transfer speeds.