CPO via eBay offers the Milwaukee M12 12-volt Li-Ion 10-oz. Caulk and Adhesive Gun for $128.04. Coupon code "PREP4SUMMER" cuts that to $102.43. With free shipping, that's the lowest price we could find by $17. It features a 10-oz. carriage and up to 400 lbs. of pushing force. Deal ends April 30. Note: This coupon can be used twice per account.