where can i find someone to appraise clowns

My grandma passed away in March and she had a large clown collection. I know most are probably not worth anything, but there are a few that are labled and appear to maybe be worth value. We dont want to get rid of them if they are we want to pass them down to our kids, but if not then we just want to get rid of them. How do I find out if they are worth anything?
Thanks,
Tracy