D&D 4th Edition Balrog. Good place to find one?

I want to add a Balrog (the giant creature Gandalf fought in the Fellowship of the Ring of the Lord of the Rings trilogy, both book and film) to my Dungeons & Dragons campaign. But I am having a little bit of difficulty procuring a monster information sheet for it. Any places I can go online to find a good custom Balrog monster? If not I could try to make one myself. Shouldn't be that hard, I've made creatures before. Thanks for any tips!