Newegg.com Patriot 8GB Secure Digital High-Capacity (SDHC) Flash Card Model PSF8GSDHC4 for 9.99 - $5 mail in rebate = $4.99 with free shipping. Patriot Signature Line (SL) Secure Digital High Capacity Flash Memory cards are based on SDA 2.0 specification, a completely new design that is required for cards and hosts to support 4GB and higher capacities. These cards adhere to SD Speed Class Rating specification which defines a minimum sustained transfer speed for SDHC cards.