I was looking for a portable heavy duty compressor for our camper trailer, but really did not want to spend too much. I know that VIAIR and ARB may be a little better units, but also cost a lot more.
Pepboys has MasterFlow Tsunami MF-1050 12V Hi Flow Portable Compressor on sale for $59.99 with additional coupon "MMJ20" takes 20% off for final price of $47.98 plus tax with free shipping or free in-store pickup.
This is the same unit as Q Industries MV50 unit which has a lot of positive reviews. It is manufactured by Q Industries and does come with 3 year warranty.
Amazon sells it for $62.37:
Jet.com sells it for $59.49:
Here is nice review comparing a lot of portable compressors (this review has Superflow MV50 which is same as MasterFlow MF-1050):
Here is side to side comparison of SuperFlow and VIAIR compressors (speculations that they may be made by same company or SuperFlow may be just a copy of VIAIR):