Model Police Car Collection

I have approximately 70 model police cars. They are generally 1:56 scale and all are packed in their original bubble pack. Shown are three examples - a 1932 Arizona Highway Patrol Ford Coupe, a 1949 Florida Highway Patrol Mercury, and a 1997 Seal Beach, California Ford Mustang. (Sorry for the photography) I am seeking information on where to find collectors who may be interested or the location of shows or exhibitions of similar items. I would also like to receive any information on where to find the value of this collection. Any information will be appreciated. And any questions will be answered. Thank you, Bob W.