Engrepo Direct via Amazon offers Prime members the Engrepo Portable Digital Air Compressor in Black or Silver for $49.99. Coupon code "TWOBVLVG" drops it to $39.99. With free shipping, that's tied with our mention from three weeks ago and the lowest price we could find by $17. Features include a lithium-ion rechargeable battery, cigarette lighter socket adapter, and LED display.