Have you tried NFL.com or dallascowboys.com? NFL.com has just about anything made about the cowboys even felt pool table covers. Try there first and if you find them, see if you can get a better price elsewhere
I have a Cowboys theme going in my build too. Well, I used the Cowboys paint colors from Home Depot If you find any make sure to post! I would love to use them too. I have done some searching as well and found nothing except neon signs and clocks.