It's funny. I have 3 snakes now, with a 4th coming in the week ahead. It obviously makes sense to buy online, if you can store and use the quantity. But... even when I only had one snake, with the cost of what these feeders are in a local pet store, it actually still cost less to buy a pack online, and store in the freezer, and then throw out leftovers if I had them over a year. A waste yes, but still cheaper. I was lucky enough, though, that I was able to pick up feeder packs at a show every so often. The local prices here range from the smaller rats being about $3 each to the larger being anywhere from $10-$15 each.
In previous times, I've posted to see if anyone living close enough to me were willing to go in with me on a purchase, to share shipping cost, but never had a bite.