I didn't see this posted so I thought I would share it. MS points card is part of their current back-to-school sale.
http://www.newegg.com/Product/Product.aspx?Item=N82E16874103060&nm_mc=EMC-IGNEFL080211&cm_mmc=EMC-IGNEFL080211-_-EMC-080211-Index-_-Xbox360Accessories-_-74103060-L021B
http://www.newegg.com/Product/Product.aspx?Item=N82E16874103060&nm_mc=EMC-IGNEFL080211&cm_mmc=EMC-IGNEFL080211-_-EMC-080211-Index-_-Xbox360Accessories-_-74103060-L021B