Today only for its mobile users, Newegg offers the SanDisk 128GB 2.5" Serial ATA 6Gb/s Internal Solid State Drive, model no. SD8SBAT-128G-1122, for $49.99. (Link is for reference only.) In-cart, it falls to $39.99. (If not using the app, you'll have to apply coupon code "MBL151001A".) With free shipping, that's the lowest total price we could find by $8. It features read speeds of up to 546MB/s and write speeds of up to 342MB/s.