Are Harbor Freight Air Compressors Any Good? Douglas Glad Writer Jun 08, 2020. See All 10 Photos. ... The Fortress compressor from Harbor Freight sells for $399 (PN 56403).

Comparing gallons to gallons, a six-gallon McGraw air compressor is available for $129.99 at Harbor Freight, and a Fortress six-gallon compressor costs $159.99.