How much for an oil change?
Depends on where you go. I generally do my OWN oil changes, and take the used oil and filters to any auto repair or auto parts store for recycling (they have to take it).
I can purchase my own NAPA GOLD filter (one of the best) for about $10, and 5 quarts of 0w-20 Mobile One for about $4 a quart. If you buy bulk 4 or 5 quart containers you save a bit more as well. Plus I know that the oil is the right oil, and the filter has been installed right, etc etc etc.
I also run Royal Purple (about $7 a quart) in my 183,000 mile Isuzu truck.
Watch for coupons in the paper, and so sorth. Some of the larger chains, like JiffyLube, Havoline, Valvoline, etc all charge about the same, depending on amount, grade of oil, etc. They also will charge you a 'disposal' fee, and WILL invariably try to sell you expensive add-ons, lilke a fuel system flush, fuel filter, air filter, windshield wipers, etc. We have three cars (04 Envoy XUV, 06 Hyundai Sonata, and a '90 Isuzu truck) and if/when I take the Envoy to an oil change place, EACH time they want to install a new fuel filter (expensive) or dump a can of injector cleaning stuff (about $50) or install $10 wiper blades....geeszh...and the Envoy has about 30,000 miles on it.
Prices for an oil change can range from $20 upwards of $70 (if you use synthetic oil).I'd say that generally speaking you'll pay about $35 or so.
Wal Mart also has oil changes, but I have heard bad things regarding drain plugs, etc so I would not recommend Wal Mart. Midas Muffler also offers oil changes, as do most tire shops (Sears, etc).
You will undoubtedly pay the most at a dealer.
I live in Southeastern Arizona.
I did take the Sonata to "Oil Can Henry's" last month (because I had to take a quick trip to Phoenix and back) and paid $38 for 4.5 quarts of 5w-20 and a filter (included tax, environmental and recycling fees).