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How often and how long are you expecting to use it? Most of the cheaper ones work and will last a while if you don't overwork them. The more expensive ones will work faster and for longer. I have this air compressor: https://www.harborfreight.com/12v-150-p ... 63184.html I use it to reinflate after I go offroading. It works pretty well. I just give it a break between wheels and make sure it doesn't overheat. It takes about 10 minutes to bring all my tires from 15psi to 40psi.