I found this 1GB SD card for free after rebate. I'm not sure if it's compatible with the Wii though. Any ideas?
http://www.buy.com/prod/connect_3d_1gb_secure_digital_card/q/loc/14982/204044459.html
http://www.buy.com/prod/connect_3d_1gb_secure_digital_card/q/loc/14982/204044459.html