I'm trying to figure that out too. I bought a 1 month old colt in wisconsin and just got a bunch of names of shippers from the breeders. They completely trust these shippers too. You have to be careful with some shippers I was told. You don't want your horse getting ulcers or sick from stress. It's around a $1300 to $2000 for my baby so far. Im going from Wisconsin to Oregon and I have to have a box stall for the baby. It's about $300 to $400.00 cheaper for a regular stall. :) I would give these guys a call.....
American Transfer 1-800-991-9770
Chuck Erb - 909-591-1304
R/B Equine transport - 503-428-6048
Equine Express - 1-800-545-9098
Good luck! I hope that will help you