Have you given an oath to the proshop to only buy there? Have they given one to you to always give you the lowest price? If one of you cheats and does the other wrong it hurts feelings and causes trouble. You might need that proshop later and he will not want to service your bow bought at another shop.
What kind of commitments are in between you and the proshop? Does the guy at the proshop give breaks in price to others and not you? Just because you buy there every year does not mean you are entitled to a price break. Talk to the guy and tell him the price at another shop. All major bow makers have prices they can not allow dealers to sell below. If one dealer can do it so can another. Talk to the guy. Don't cheat on your local proshop... unless they are unfaithful to you.