I've long read all the books, but am only just now getting around to reading the comics and decided to start with the Welcome to the Jungle series.

However, Amazon has 3 follow-ups (#'s 2-4) that are only available to be purchased on Kindle.

Are those three included elsewhere, like maybe the Omnibus collection, or do I simply have to buy the digital versions if I want to read them? I prefer physical copies where possible.