Some shelters/rescue will let you rent a have a heart trap, or you can buy one (not that expensive). bait it with canned cat food.
They are too cute, I bet you could find homes on craigslist. They would make great barn cats too, maybe see if local barns need a cat or two for the mice. For barn cats, you might want to speuter them yourself, but as a pet you can tell the new owners the price is speutering and shots, and they can pick them up from the vet of their choice. Maybe pay half of it if you can afford it.