Alex, you might check around & see if there are other snake-keepers in your area (or a herp society) that you could split a frozen order with to save money.
I've heard of herp societies doing that among members. To find other individuals in your area you might inquire thru vets (esp. exotic) offices too- many
vets have a bulletin board as well. (I'm no help, I'm nowhere near you & raise my own rodents.)