If you have a few bucks for shipping, I like Perfect Prey. Immaculate feeders. You can even get single rats of some sizes. I've ordered to NC for years, and they arrive rock solid even when we're at 100 degrees. Got any reptile friends in the area? I often split an order with a friend to save on shipping.

https://perfectprey.com/frozen-rats/

Do you know the weight of the rats compared to the snakes?