Big Sky tool offers the refurbished Hitachi 4-Gallon Portable Electric Twin Stack Air Compressor for $83.97 plus around $9 for shipping. That's $6 under our mention from last April and about $59 under the lowest price we could find for a new unit. It weighs 53 lbs. and features a 15-amp direct-drive induction motor, cast iron pump, steel-encased gauges, and thermal overload protection.

Note: A 1-year Hitachi warranty applies.