Just noticed today that the Kindle Store now has some Marvel Comic story collections available, in addition to their DC offerings.

Including classic stories like:

X-Men: Days of Future Past

Wolverine (mini series)

X-Men: Dark Phoenix Saga

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Infinity Gauntlet

Even Secret Wars

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If you've subscribed to Marvel Unlimited, this isn't really necessary but if you haven't, or if you don't want to wait for more recent releases that haven't shown up yet, something to keep in mind.