A couple options....
There are several of us in the western WA area, & you can go in on large orders with others.
There's a couple feeder breeders in the Puyallup area (I think) Glacier Rodents is one of them. They provide feeders for zoos & the general public. They are known for very high quality rodents.
There's another breeder, but I have only heard about her from another person. I will ask about that other breeder, but I think she's in the Puyallup area as well.
I generally get mine from Rodent Pro, because of the large orders. (I also feed whole prey to my ferrets.)
There's also a member of the PNWHS that orders large amounts of Rodent Pro feeders & will sell smaller amounts to local people.