I built my own setup for them. Two levels with ledges on both, and a trap door connecting them at the back. When I had 9 girls, they had the run of the whole thing, and I just latched the trapdoor shut when I had a boy living in the bottom.
Top half with the girls. It's actually a lot deeper than it looks, one floor was the equivalent to maybe a 35/40gallon tank?
A better shot of Feather's variegation, but colour isn't true here.
Cricket - chocolate fox. I never got good shots of her because she was the speediest and a hooligan.
Tamu, back in the old cage.
Ajia.
I kind of got fed up when I had the pet shop litter. In Europe, where I first started keeping mice, males can live together. I assume since they have been domesticated for much longer over there. No problem having two tanks - one for the boys and one for the girls. In North America, the guys are asshats to one another for the most part, so even the litter of brothers I had to separate at around 3 or 4 months into their own bin. Even girls would sometimes fall out which always surprised my mouse-pal in Switzerland. It was a lot of work to keep on top of all the separate cages so if I got into mice again I'd probably only keep girls.