TigerDirect offers the Crucial MX100 Series 512GB Serial ATA 6Gb/s 2.5" Internal SSD, model no. CT512MX100SSD1, for $189.99. Purchase via Visa Checkout to cut the price to $169.99. With free shipping, that's the lowest total price we could find by $20, although we saw it for $2 less last month. It features read speeds of up to 550MB/s and write speeds of up to 500MB/s.