By me, dealer installed tires by are $30 ea, for my tire, "free" if I buy the tire from them. The tires I wanted (Metzlers) cost about $35 more from them, after adding taxes, so I installed them myself.
Installing tires without shop tools is physically demanding and requires some knowhow, but, as a wrencher, I decided to take the installation fee and buy some tools and do it myself. That was only about $40 more per tire, but I get to keep the tools plus a bruise on my forearm where the tire spoon snapped back on me
The tools I needed to swap the tires:
2 tire spoons (10 inch - $8 ea - I coulda used a 3rd one, about 15 inches)
1 1,500 lb motorcyce jack ($60 - I dont mind owning this
2 14 inch boxing clamps (already had them)
1 bottle of generic window cleaner ($1.50)
some scrap 2x6 to make a wheel holder to protect the brake disc and belt pulley.