So to the (rare) people out there who only own one snake, how do you deal with ordering food online?

It seems like I have to order food that's too big for my snake so that it's not way to small by the time she gets to the end of the bag. It's probably going to get a little better once the bags start coming with 25 instead of 50, but I'm just curious, do you order a bigger size and let them grow into it, or do you order the right size to start and feed like 3 at the back end of the bag?