Automate physical orders with 1shoppingcart recurring billin

I am looking for a way to automate physical products (CD's and DVD"s) with 1shoppingcart's recurring billing. For example, I want to offer a CD of the month scenario. Currently, the recurring billing takes place each month but it's a manual process to know which CD to ship based on what month of the program they are on. I would like a way to keep track of what month a customer is on and what CD should be sent. Thanks.