I have seen it before in Barnes and Noble. Never bought one. Aren't the monthly guides cheaper? If you need to you can always look up auction prices on coinfacts or peruse the sold listings on ebay.
I used to buy this book because it contained Canadian and Mexican coins, along with US, in a single volume. I haven't bought it for a number of years, though. The most recent edition I could find (so far) is from 2020. Searching for a 2021 edition brings up nothing. If the Editor retired and no one wanted to take up the mantle, that makes sense, I guess. It looks like it may have become past tense.
You know it's funny the last version I have is the 2019 version I actually love this book it's a good book I couldn't even find The 20/20 version
on Amazon but out of stock 2020 North American Coins & Prices: A Guide to U.S., Canadian and Mexican Coins: Harper, David C., Michael, Thomas, Giedroyc, Richard: 9781440249099: Amazon.com: Books it's also on Goodreads.com .. if you look at the buttons on the left you may be able to read a PDF of it?? but I'm not sure as I don't have a login for the website 2020 North American Coins & Prices: A Guide to U.S., Canadian and Mexican Coins by David C. Harper | Goodreads