Tire change? Depends on the tires. If its just to change a flat, depends on where you live. 10.00 to 15.00 max. If you mean a complete set of tires, It depends on what kind or brand you want.
on average around $10 but people have been known to charge Bill Gates $50 million for one, so it kind of depends on how nice your car looks... So get a really crappy car people!