There are several breeders in the U.S. that have Lahores.
The National Pigeon Association (NPA) is a great source for finding breeders and affiliated specialty breed clubs.
http://www.americanlahoreclub.com/Also, I would recommend that you go to the NPA young bird show in Louisville Kentucky at the state fairgrounds beside the airport and six flags. Each years they have a show that has all breeds present with people from around the world shipping their birds in for the show and themselves. I'm certain you'd find Lahore's there, especially if you contacted someone ahead of time and they brought them there specifically for you.
I've had rollers, homers, modenas, etc and bred toward the standard of perfection for each breed and competed with them at many a show.
Attached is the Lahore standard of Perfection.