I used to buy 5-6 at a time and euthanize them. It would last me all month and it really doesn't take up too much space in the freezer.
My dad used to freak out about the dead rodents in the freezer, but I started putting them in brown lunch bags and labeling what they are.
Now I breed rats, so there could be 20 in there at any given time lol.
If they are really that paranoid, look around at yard sales, my grandma got a small freezer for $20 one time.
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