I saw a mention of John Prine's Great Days: Anthology on a site and decided to check on its availability.
SwapaCD.com lists that 29 people have this on their wish lists. I have never seen a number that high (on that site) for those wanting an album, much fewer those wanting a double-CD set.
On Amazon, the set goes for $114.96. On discogs, there's one for sale at $235. [I have no idea what the prices were before his recent death.]
As with any anthology, it does include many, many great songs, but some of the songs it does not include are: "Your Flag Decal Won't Get You into Heaven", "Diamond in the Rough", "Mexican Home", "Often Is A Word I Seldom Use", "Accident (Things Could Have Been Worse)", "Way Down", "Hobo Song", "Chinatown", "Ubangi Stomp", "Bottomless Lake", "Let's Talk Dirty in Hawaiian", and "Jesus the Missing Years".
You may stop reading now, as I'm done.