ToolsmithDirect via eBay offers the Kawasaki 18-volt 20-Piece Cordless Drill Set, model no. 840107, for $42.95 with free shipping. That's the lowest total price we could find by $12, aside from the deal below. It features a drill, battery, drill bits, driver bits, magnetic bit extension, and case.
A close price: Sears offers it for $46.99 with free shipping via Shop Your Way Max.