Needed: Small Square Metal Wire Mesh

I'm in need of a small square (say 1 foot x 1 foot or so) of metal wire
mesh, with openings 1/4 inch or smaller. Can anyone give or sell me this?
(I'm trying to cover a car's cabin air filter to keep mice from getting
in to the car's interior.)

Thanks, -- Jonathan Thornburg <jt.bhbkis@gmail.com>