Walmart offers the Stanley FatMax 350-amp Jump Starter with Compressor in Silver, model no. J7CSR, for $39.88. Opt for in-store pickup to dodge the $4.97 shipping charge. That's tied with our January mention as the lowest total price we've seen. (It's also the best deal now by $20.) 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.

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