Here is a link to the Fullblood Limousin Allinace, check out their members page. I don't know where you located but there should be someone fairly close. If you don't find what you're lookin for there PM me and I'll see if I might know someone.
SE Minnesota, ive got about 150 head of mixed cows and allways used to use limi bulls on them, but that was years ago. and it seems the ones i get now, usually black, dont throw the muscle that the ones i had before did.