Lowes offers DEWALT 15-Gallon Portable Electric 225 PSI Vertical Air Compressor for $319 (reg. $439) with free shipping. 

Product Description:
The DEWALT® D55168, heavy duty 15 Gallon, 225 PSI wheeled compressor is an oil-free compressor that delivers 5.4 CFM at 90 PSI, with an efficient, high-pressure technology that allows for longer tool runtime and increased pump/motor life. This compressor is perfect for powering a dual-action sander or a random orbit sander, or fastening using impact wrenches and ratchet wrenches, or powering grinders, cut-off tools, and reciprocating saws. Also useful in supplying power for spray guns in painting, gluing, or lacquering applications. Compact design allows for easy transport and storage.