SanDisk Extreme SDSSDX-240G-G25 240GB Solid State Drive for $149.99 shipped.  Here is a screenshot for your reference.  The SanDisk Extreme Edition is the enthusiast version that performs better than the cheaper value-oriented ones.  It features up to 550 MB/s read speed and 520 MB/s write speed.  Most places have this SSD for about $200.