SanDisk SD8SB8U-256G-1122 X400 SATA 2.5" 256GB Internal SSD - Newegg.com
SanDisk X400 256GB SSD Review | KitGuru
SanDisk, X400 M.2 2280 256GB, Solid State Drive (SSD), (Renewed)
7RJNT - Refurbished - DELL / SANDISK 256GB SATA III 2.5 INCH SMALL FORM FACTOR SFF 7MM Z400S SERIES 6GB/S SATA3 READS 546MB/S WRITES 342MB/S SOLID STATE HARD DRIVE SSD