I've used both aspen and pine as bedding. Aspen cost quite a bit more than pine, as pine is a choice lumber wood, and I get the shavings from an Amish lumber yard for about $0.25/cubic ft vs $13 for 8 cubic ft of aspen. Pine seems to control odors better than aspen, but aspen is normally less dusty.
An exhaust fan can be anything from a box fan blowing air out of the room, to a swamp cooler fan, I just wired in a couple of the same fans that you turn on when you go to the bathroom, since I had to rewire that side of the house.
For 1.4-1.5, you could do 2-3 10 gallon aquariums, keep 1-2 moms per, and just rotate the male around. This would (in theory) keep all of your moms from getting preggo at one time and having 20-100 pinks at once.
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