newegg offers the Crucial 512GB M4 2.5" SATA III 6Gb/s Internal SSD, model no. CT512M4SSD2, for $529.99 with free shipping ($1.04/GB). (Amazon charges the same.) That's $50 under our mention from three weeks ago and the lowest total price we could find now by $63. It features read speeds of up to 500MB/s and write speeds of up to 260MB/s.