Dell Home, via its Member Purchase Program, offers its Dell 512GB Serial ATA 6Gb/s 2.5" Internal SSD Upgrade Kit for Dell Desktops and Notebooks for $189.99 with free shipping. That's the lowest price we could find by $114, excluding the below mention. The kit includes a 512GB SSD, 2.5"-to-3.5" desktop adapter bracket with screws, 7mm-to-9mm laptop adapter, SSD enclosure, USB 3.0 cable for enclosure, SATA cable, and power cable.

A close price: charges $199.99 with free shipping.