If you're at all interested in Charles Schulz's Peanuts, it's a good idea to invest in Fantagraphics' The Complete Peanuts. It's a 26-volume set that contains every strip that saw publication, with around two years of strips per book. There's a Kindle version if you're strapped for shelf space, but if you're shelling out for 26 volumes of anything, you may as well go for the physical edition.