How much is a oil change for a 2005 Ford Explorer?

Im doing a project and its awhile before its due but I can't find out how much a Oil Change for a 2005 Ford Explorer. Help please?How much is a oil change for a 2005 Ford Explorer?most vehicles have a standard 20 to 30 rate for changes at oil changing garages like grease monkey or other limited service chains, also small garages are cheap, look for coupons in newspapers and mailers.