Where can I find semi-truck wallpaper border?

I am looking to redecorate my 6 year old son's bedroom. He is infatuated with semi trucks and I would like to try to find a wallpaper border that has realistic trucks on it. I am only finding juvenile type vehicle borders. I am not looking for any specific color or pattern or make of truck, etc. just an actual semi-truck border. I have found one auction on ebay but I was hoping to find a few different options. I have typed in searches using every combination of words and phrases that I can think of. Any istance would be greatly appreciated. Thank you for your time and input.