ability allow allowing cards checkouts customer customers day defaults designed disables feature few flyers free inadvertent item items limit losses marketing misconfiguration potential process products purchased quantities quantity security seller service system unintentionally unit update

I need to allow customers to update quantities on a few free marketing items (cards and flyers). When the item is free, it disables the ability for the customer to update the quantity and instead defaults to "1". Any ideas?

Free items can only be "purchased" one unit at a time, and our system will only process up to 100 Free Checkouts per day for a given seller. This is a security feature of our service designed to limit potential losses in case a seller makes an inadvertent misconfiguration allowing their products to be purchased for free unintentionally.