Can anyone tell me if there is a good online or book to give me the values of Nevada Ashtrays. I have a few, many common but am wanting to know if I ever come across a good one.
The picture is an Arizona Charlies Ashtray, it is clear. I went to the Ashtray project site and there is only a green on and it says the value is 20+, I think.
Is there anything that gives a more accurage value?

Thanks in advance
Rodney R 7886 NV