Fragrance Outlet In store price twice as available in other retail stores Chesterfield Missouri

Hello. I happened to visit their store yesterday and buy few perfumes(5 in total). I ended up paying 280$. Upon reaching home when i searched the prices of the brands that i purchased. i realised that I was totally ripped off my money. the prices were almost half of what i paid in store. My online sources were amazon, overstock.com, and few other frangrance stores. Today, i went to the store for a return and the lady at the cashier tells me that they donot give a refun but they give a in store merchandise credit. WHat should i be doing with that credit as i have to buy the same stuff they have in store for higher prices.