How to humanly euthanize a pinky?

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Petsmart/petco mice are ridiculously priced (as is everything else) . I can buy almost 12-15 (depending on the size) mice at the store I go to for the price of 6 at petsmart. The drive is about 15 minutes, but buying in bulk there is worth it.

I would look around - I would also try to bump him/her up to small adults sooner than later. Buy a couple hoppers, and a couple adults.