I'm using a 8GB SanDisk card and it works flawless. I got mine for $67.99 @
Canada Computers - Flash Memory/Drives > Secure Digital > microSD Cards : SanDisk microSDHC 8GB with Adapter and SD/SDHC Reader - TransFlash (SDSDQR-8192).
So check it out if your from Ontario GTA area. Much better deal compared to Tigerdirect.