Manx Club

This 12 Volt air compressor connects directly to your battery with alligator clips and it works very well.   $69
http://www.walmart.com/ip/Masterflow-12 ... escription

This is the one that we have from Harbor Freight (They have their main So Cal store a couple miles from our house).  $59 and works great.

http://www.harborfreight.com/12-volt-150-psi-high-volume-air-compressor-66399.html