Wishlist for Marketpress Plugin

Hi, I just started using the Marketpress plugin and the one feature I think is missing is a wishlist. I've looked for it before and only found it for one plugin and it costs about $40 (just for the wishlist feature, and with no support!). I was wondering if this is something that could be done for Marketpress as I think it's the best e-commerce plugin for WP out there. Thanks.