How to emove all Prices, but "add to cart" remains functional

Hi everyone,

My site http://test.chuanjoo.com/shop/ is for catalog purpose, I want no prices to be displayed. However, I would need the add to cart button to remain fully functional, this acts like a shortlisted order list, where they can then use to call to speed up order process.

Any suggestions is welcome.

http://wordpress.org/extend/plugins/woocommerce/