Home Depot offers the Milwaukee M12 Fuel 5" Circular Saw with Free Battery, model no. 2530-20-XY, for $149 with free shipping. (ToolUp via eBay has it for the same price with free shipping.) That's the lowest total price we could find by $6. It delivers up to 170 cuts per charge and features a Powerstate brushless motor, Redlink Plus intelligence, and a Redlithium XC 4.0 battery pack.