Airline Approved Mammal Shipping Container, $75-$100 for Delta Dash, health certificates, and the mice.

If I were you, I would get about 8-10 young female mice, put 2-3 males in with them in a big cement mixing tub, and just leave them alone. I have the same set up right now and have about 4 litters total, plus a few more coming soon. After a month or two, you should have babies