Cart features, how can I

[saiborg]

Hi, how can I do to get these features in your cart? :
MINIMUM NUMBER OF PRODUCTS = 3
NUMBER OF PRODUCTS PURCHASED = 3 OR POSSIBLY A MULTIPLE OF 3
Sorry for bad english

[Danny Poole]

Good question, have you solved this yet? I want to sell only in quantities of 12 or at least not let a customer checkout until 12 items have been added to the cart.