I believe Costco does this for free with all tire purchases.
http://tires.costco.com/TireInformation.xh...CostCoAdvantageQUOTE
Additionally, we inflate your tires with nitrogen, not compressed air. Nitrogen retains tire pressure better over time than compressed air, which can positively impact the life of your tires, as well as the fuel economy of your vehicle. We offer this service FREE OF CHARGE.