Walmart offers the Stanley Fatmax 350/700-amp Jump Starter / Air Compressor for $39.97 with free shipping. That's tied with last week's mention and the lowest price we could find now by $12 today. 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