I have good news for you Rachel. I have found a store that sells loads of orange fabrics, about 7 pages in fact, sure to find something in there I think?
Here is the link:
www.fatquartershop.com/store/stores/-app/Browse-dept-items.asp?T=&Store
Hope this works for you, if not just put in www.fatquarter.com
and search button for Orange
Elle