I have never seen them make a Mickey head-shaped cake that's covered in fondant. Usually it's chocolate ganache. Perhaps she means the Mickey's Delight decor style like they do for weddings? You can see what that looks like in@Trimothy's post, above (but yours would be sans white chocolate Mickey unless you paid to add him).
So the lady from POR sent me an image of the "Mickey head shaped cake." Here it is:
She did not give me the cost for this. However for an 8" fondant covered mickey themed cake with vanilla cake and strawberry moose we were quoted $80. The cost for a 10" cake would be $96. We thought these prices were reasonable so I will be placing the order tomorrow. We don't travel till the end of August so we wont know how it comes out for a while . The process felt fairly simple as long as you know what you want.