I second the recommendation for snap traps. I had (note past tense
) two mice in my kitchen three years ago; approx. March 2007. Purchased three snap traps.
After my cats (a different pair from the current pair
to take care of the situation, I baited the traps with salt-free peanut butter (it's what I eat) and placed them under the kitchen sink along the back of the cabinet, with one along the side of the cabinet "shared" with the set of shelves which bore the...ah...evidence of rodent invasion.
Both mice were gone in three days, if not sooner.
Sunset Zone 17, USDA Zone 9