I found mothballs were effective, and very cheap. I don't know how much - I bought a box years back and only used a few.

--Karen

LEAVE CATS AND ANIMALS ALONE THEY ARE BEAUTIFUL I HAVE A GORGEOUS THREE YEAR OLD CAT CALLED HONKY CAT (AFTER THE LOVE OF MY LIFE ELTON JOHN)
I ALSO HAVE A DOG CALLED NIPPER,A RABBIT CALLED NALA,A HAMSTER CALLED RAFIKI BOTH NAMES TAKEN FROM ELTON`S LION KING TWO GORGEOUS GERBILS CALLED BENNIE AND GEORGIE,BENNIE AFTER ELTON`S BENNIE AND THE JETS AND GEORGIE AFTER MY VERY SPECIAL LATE GRANDAD GEORGE WHO MEAN`T THE WORLD TO ME,SO THERE