You can try consulting at http://www.vhpg.com/madden-mut-coins/
I bought a lot of Madden coins from them at a very cheap price, and their games provide a lot of things, so I think they should also provide or have channels, you can ask, this should be a very effective way, if you can't find it in this store, you can also consult more stores, I hope my answers will help you.