Change the Wondering Traders price

Ok so I have gotten a few wondering traders at my house but they all want emeralds. What I propose is that the wondering trader allows you to trade other items besides emeralds to get something and the stuff that requires emeralds to buy should be a good trade. Like seriously, one block of red sand for an emerald!? Emeralds are hard to come by and if you mine for them they are extremely hard to find. So to wrap this all up, change the prices and allow the player to trade nonemerald items for items and to sell enchanted or hard to find or craft items for emeralds