TigerDirect offers the Seagate 480GB 600 Series Serial ATA 6Gb/s 2.5" Internal SSD, model no. ST480HM000, for $279.99. These mail-in rebates of $20 and $20 cut it to $239.99. With around $7 for shipping, that's $0.52/GB and the lowest total price we could find by $95. It features read speeds of up to 500MB/s and write speeds of up to 400MB/s. Deal ends December 16.

Update: Be sure to checkout via V.me by Visa, which drops the final price to $219.99 plus about $7 for shipping ($0.47/GB).