Transcend 4GB 150X Secure Digital Card (SD) $50.99

Amazing data transfer rates: Up to 150X speeds (22.5MB/sec)Supports Error Correcting Code (ECC) to detect and correct errorsSupports In System Programming (ISP) to load firmwareSupport power down and sleep modesMechanical Write Protection Switch requirements

Buy.com is carrying this 4GB Secure Digital Card for $50.99