I'd be very surprised if you couldn't find someone selling the right sized rats frozen within reasonable driving distance of you.
If you need to order and your snake is currently eating adult mice, I'd say an order of weaned rats will last you a while. Let's say a 50 pack would not go to waste. If your snake is still hungry you can always feed a second one - 2 of those is a good size meal for even a full grown adult.
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