Is there a playboy chip price guide available? Or can someone recommend a specific person that I should contact who specilizes in Playboy chips for this information?

I had a person contact me this weekend wanting these chips from my collection but I have no idea what a fair price would be for them. As a result, I was looking for an expert opinion on the value of these two chips (fronts and backs shown below). Any help would be greatly apprecated. Thanks.