In 2005, a company called GitCorp had the license deal of a lifetime for comic book fans everywhere. They were allowed to sell Marvel Comic books in PDF format, and they released several collections of Iron Man, Captain America, the Hulk, Spider-man, X-men, the Avengers and more!
In 2007, Git Corp lost the rights to sell scanned Marvel comics, and since then, it's been harder and harder to find any of the Git Corp Marvel Comics DVDs.
Amazon still has some at affordable prices, and this particular deal contains all Fantastic 4 comics from 1961-2004 on a single DVD. (Free s/h with Prime)
Fantastic Four Vol. 1 #1-416
Fantastic Four Vol. 2 #1-13
Fantastic Four Vol. 3 #1/2, 1-70, 500-519
Fantastic Four Annuals #1-32
Since Git Corp scanned each comic book, these digital PDF files contain the original ads, letters in the back pages, etc. Reading them is like seeing a time capsule to the past.
Note: PDFs can be viewed on PCs, Macs, Android and Apple devices. (I read them on my iPad)