You can buy everyday items that are gluten free and vegan friendly as well. Look at the ingredients and if they don’t have wheat, barley, rye, or triticale then there’s a good chance it’s gluten free. There are some exceptions to that like canned soups or broths, but you don’t have to strictly get items from a gluten free section for it to be gluten free. And your wallet will thank you.
But to answer your question, some GF products have ingredients that are more expensive than wheats. Like tapioca flour for example. But most of it falls under the “healthy” food tax