Walmart offers the Stanley FatMax 350-amp Jump Starter with Compressor in Silver, model no. J7CS, for $39.98. Opt for in-store pickup to dodge the $5.97 shipping charge. That's tied with our mention from a week ago and the lowest price we could find now by $21. It features an output of 350 amps (700 amps peak), 120 psi compressor, and pivoting LED light.