Big Sky Tool offers the factory-refurbished Hitachi 5/8" to 2" 18-Gauge Brad Nailer, model no. NT50AE2, for $35.66 plus around $7 for shipping. That's $16 under the lowest total price we could find for a new one. It includes safety glasses, air fitting, hex bar wrenches, and a carrying case. A 1-year Hitachi warranty applies.
Note that this is a "Grade C" reconditioned item and may feature substantial cosmetic blemishes. You can alternatively get the Grade A refurb for $6 more, which features less signs of wear. Click here for more info on the grading system.