I've made six mice of varying sizes from a small to a rather large, but all can be accurately called life sized, depending on the species.
Some kinds of fancy mouse I've read can reach a foot long (with tail).
My longest one here is 8" with the tail.
Interested potential buyers of mice in the state of New Mexico should contact Manitou Galleries of Santa Fe.
Any New Mexico inquiries will be directed there.

Chubby
Sprightly
Nosey (above)
Tidy
Natty
Tiny (below)
Below; Chubby, Sprightly and Nosey at large in the kitchen...
Sprightly and Nosey on a field trip
Rodent Links...
Rattie Ratz Dedicated to the rescue, rehabilitation and re-homing of domestic pet rats and other small animals in the greater San Francisco Bay area.
Eva's mouse page. The web site of Eva Johansson in Sweden. With information on other exotic animals such as Octodon degus, Spiny Mice, and Praomys natalensis (or Common African Rat).