Nothing for DS games supports the popular compression formats. Some specific emulators (NES/GB/C, etc.) might support zip.
$20 for 32GB.
http://www.newegg.com/Product/Product.aspx?Item=N82E16820313184
$20 for 32GB.
http://www.newegg.com/Product/Product.aspx?Item=N82E16820313184