I was pondering the same thing today. I know they'll be the cheapest at the show this weekend, but how many do I want to buy? How much money do I want to save? How much freezer space to I want to devote to this? . . . .
I buy 6 months worth of frozen rodents at a time, I really don't use my freezer for anything besides emergency water during hurricane season so I use practically my entire freezer. Many people will get a standalone freezer just for rodents.