Engrepo Direct via Amazon offers its Engrepo Portable Digital Air Compressor in Black for $44.99. Coupon code "7X5NKY33" drops it to $40.01. With free shipping, that's the lowest price we could find by $13, although we saw it for $2 less in August. Features include a lithium-ion rechargeable battery, cigarette lighter socket adapter, and LED display. Deal ends December 1.