NewEgg is selling A-Data Class 6 MicroSD's (4GB) for $39.99 + $4.99 shipping, but they also have a $10.00 mail-in rebate. http://www.newegg.com/Product/Product.aspx...N82E16820211196 These cards have a 0.7 to 0.8 ms response time. This is the same as Kingston Japan 1GB cards. The cards have a lifetime warranty, but you have to sent them to Taiwan. NewEgg offers a 1-year replacement plan free.