Corsair Accelerator Series CSSD-C30GB 2.5" 30GB
This is a dedicated SSD cache drive. It is installed as an upgrade to a system that has an existing HDD with win7 that is used for the boot drive. It comes with a license key for the dataplex software.
This drive gives you most of the performance advantage of a SSD boot drive without having to change anything.
$59 - $10 rebate, free shipping, valid to 4/30/12
Note: you may require a 3.5 to 2.5 adapter bracket, a SATA cable, and some screws, all not included