Or you can buy a bunch of common old style Victor mouse traps, screw them onto bits and scraps of lumber (to keep the mice from dragging them away), bait them all with Milky Way candy cut into small bits, set them against walls and check them every couple of days. These never wear out and mice will keep getting caught as long as you remove the dead ones. There are also some corn gluten mice control products that dehydrate them and wreck their digestive system...but as Jerry said, they'll go somewhere to die. Avoid any product that claims to make them thirsty so they'll leave in search of water. It doesn't work like that.
