Joe, I also just breed a few to have live on hand. Mine are in the garage pretty much year round because of the smell. The only exception is if it is really cold and I have a new litter. Right now it has been getting down into the 40s and they are fine, but production is slower too.
My males tend to have fairly short lives as I often feed them off when all the females are pregnant, then get a new one when I need to. The females cages get bad when they are raising a litter, so all you can do is frequent cleaning. The males just stink, even if you clean every other day!
I have been known to mix a small amount of cedar bedding in with the aspen and that helps. I know its not good for the mice, but a little doesn't seem to be too bad for them.
I was able to get some deer mice from a friend, and they don't smell too bad, but they have small litters, and are mean!
I have considered gerbils, as they also don't smell bad. They have small litters too, but at least they are handleable.
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Kent
1.1 Hypo (het lavender, striped) corn snakes, 2010
1.1 Gray-banded king snakes, blairs phase, 2008
6.10 Gray-banded king snakes, 2011
1.1 Oregon rubber boas, w/c 20??