Most of them should have values, he uses a grading system. On the home page the menu shows grading/pricing scale. Click on that and it will tell you approximate prices for each grade.

For example, if you click on Tahoe, then click on Cloud's Cal Neva, you'll see that we have an ashtray that is a grade 2. Click on the grading/pricing scale, you'll see that grade 2 is $20-$100. Yes, that's a wide range...thanks to ebay! I once saw a $500 ashtray sell for $3500 in a bidding war. Prices have dropped on some trays, and I've seen that same tray sell recently for about $200 or so!