NCIX offers the Crucial 512GB M550 Serial ATA 6Gb/s 2.5" Internal SSD, model no. CT512M550SSD1, for $179.99 with free shipping. That's $20 under yesterday's expired mention and the lowest total price we've seen. (It's a current low of $58.) It features read speeds of up to 550MB/s and write speeds of up to 500MB/s. Deal ends August 20.