I have the opposite problem at my local store. They have retired breeder mice then "small" rats that are to big for my snakes. Got a small rat one day and there was no way my 300g snake was going to eat it. Weighed the rat at over 100g. I didn't think to check it til I got home. My bad. I've found rodentpro sells xlarge mice for $.80 ea. Or comparable sized weaned rats for $1.25 ea. Cheaper to feed mice for the time being in my case. The other thing is I would imagine a mature animal would have more calcium and other minerals than an underdeveloped one?
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