Walmart offers the Stanley FatMax 350-amp Jump Starter with Compressor in for $36.47 with free shipping. (Amazon and Jet.com have it for the same price). That's $4 under our mention from last June, the best deal now by $16, and the lowest price we've seen. It features an output of 350 amps (700 amps peak), 120 psi compressor, pivoting LED light, and 12 months of Priority Auto Assistance road-side service.
Update: The price has increased at Walmart and Amazon; however, Jet.com still offers it for $36.47 with free shipping.