My client typically sells items in single units. However, they have one item (shot glasses) that they wish to sell ONLY in quantities of 2 at a time. Is it possible to sell units 2/for $25 or similar? So when selecting the item, it will default to 2 units for the $25 price? (or if the individual items are priced at $12.50 each, the buyer can only select in multiples of TWO? (minimum quantity of 2, 4,6,8, etc.)?