Sears offers the DieHard 1150-amp Portable Power Source, model no. 71688, for $139.99. Coupon code "SEARS5OFF50" drops it to $134.99. With free shipping, that's $25 off list and the lowest total price we could find, although we saw it for $40 less on Black Friday last year. It features a digital display, automatic USB protection, and 100 PSI automatic digital air compressor.
Of note, Shop Your Way Rewards members will earn a Sears credit with this purchase and may be eligible for additional credits and discounts.