Amazon offers the OCZ Synapse Caching 64GB Serial ATA 6Gbps 2.5" Internal SSD, model no. SYN-25SAT3-64G, for $102.40. This $20 mail-in rebate cuts it to $82.40. With free shipping, that's the lowest total price we could find by $42. This drive uses software to automatically cache frequently used data from your existing hard drive; you don't store files on it directly. Rebate ends today.