Ebay offers Refurbished Milwaukee M18 Fuel Air Compressor for $246 (reg $368.40) with free shipping.

Product Description:
The MILWAUKEE M18 FUEL 2 Gallon Compact Quiet Compressor is designed for the professional carpenter and remodeler. This quiet portable air compressor is only 68dB(A), making it the quietest cordless compressor on the market, and quieter than most corded compressors. Its compact size makes it easy to transport on, around, and back off the jobsite with a low profile and stackable design. It has the run-time a professional needs to stay productive, providing up to 1,600 18ga brad nails per charge. It is compatible with all M18 REDLITHIUM batteries making it easy to swap packs and keep running to finish the job. Reconditioned product. “Bare Tools” are sold without batteries or chargers, making them ideal for users who already own compatible power sources. However, if you don’t already have the required battery and charger, you must purchase them separately. The quietest cordless compressor available at only 68dB(A) Compact for easy carrying & less fatigue while transporting