Walmart offers the Stalwart Portable Air Compressor Kit, model no. 75-35664, for $19.44. (Amazon charges the same with free shipping for Prime members.) Choose in-store pickup to dodge the $4.97 shipping fee. That's the lowest price we could find by $8. It features a 250-psi (18-bar) compressor, 12V DC 10A power, pressure gauge, 8.5-foot power cord, and 26.5" air hose.