Are you looking for 12v or 120ac? Off-road 12v would do the job. Most of my rigs have permanently mounted 12v air compressor. For your application check Air Zenith. ARB makes some nice units both portable and hand carry. Found a cheaper option for you. How much do you want to spend?
http://www.sdtrucksprings.com/index.php?main_page=product_info&products_id=24236¤cy=USD&gclid=Cj0KEQjw6J2eBRCpqaW0857k9p4BEiQAWarYbNxaBeNaEkmiowBdyyBqwlAKQvFHxTRhvDSAr6UkMbkaAkY58P8HAQ