Walmart offers the Stanley Fatmax 350/700-amp Jump Starter / Air Compressor for $44.98 with free shipping. That's the lowest price we could find by $13, although we saw it for $5 last month. Features include: 350-amp instant starting power, 700 peak amps 120-PSI air compressor 3.1-amp USB charging ports 12-volt DC plug 270° pivoting led light reverse polarity led indicator and audible alarm