Lure some mice to your place and breed them. Free cat food ;)
Quoting: honorable man I had to set traps the other day.
When I was checking out at the store the cashier
looked down at the cat food, and the
mouse traps and said, "There's something
wrong with this picture."
I caught 2 mice over the course of three
nights (that was all there were)
and I opened the traps and dropped the dead
mice in front of our fattest lazy cat,
and he shook them around like he had caught
them himself, growled, then...down the hatch.
I don't feel like I should have to do that.