I really want an EZ flash IV, how about these sites.
http://www.r4gameshop.com/index.php?route=product/product&product_id=217
http://www.r4seller.com/ezflash-iv-mini-ezcart-slot2-sd-multimedia-flash-card-for-gba-spnds_p453.html#show
They claim to have them, but I'm not sure how legit they are.