Amazon offers the Transcend 256GB JetDrive Lite 360 Flash Expansion Card, model no. TS256GJDL360, for $138.99 with free shipping. That's the lowest total price we could find by $16. Designed for 15" MacBook Pros with Retina from late 2013 to mid 2015, it features a 95MB/s read speed and 60MB/s write speed.