Does CDN cover the US Commemoratives (esp. half dollars, 1892-1954)? I can't find the info anywhere. If not, are there any better price guides other than Redbook (yeah, right) or closed auctions? I asked a while back about "modern" commemoratives here. Maybe the same answer? https://www.cointalk.com/threads/greysheet-and-high-grade-modern-commemoratives.243023/
The Greysheet has a page devoted to sight-seen, accurately graded early commems while the Bluesheet has information for what I consider to be the worst examples of overgraded coins in high grades. However, as Doug has stated, auction records are generally the best way to go with values for these.