What are brand new stock tires and wheels worth?

I’m wanting to upsize my tires on the sportsman XP 1000 I’m buying,I asked the dealer what he’d give me for my stock ones,before I even get it,he mentioned $100-200 plus 10% off a new set. I think it should be more,what do you guys think I should get for them! This was actually the parts guy that quoted the $100-200 for my stock wheels and tires