Engrepo Direct via Amazon offers the Engrepo Portable Digital Air Compressor in Black or Silver for $49.99. Coupon code "RR7ZDSXV" drops it to $39.99. With free shipping, that's tied with our mention from two weeks ago and the lowest price we could find now by $22. Features include a lithium-ion rechargeable battery, cigarette lighter socket adapter, and LED display.