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To be fair, they also offer a digital library of many (kind of randomly selected) 6 months and older issues for $10 a month or $5 if you pay for a year. Marvel's digital strategy is kind of confused right now.

In the case of Marvel, the 3.99 physical titles come with a digital backup.

I don't read too many comics, so I don't mind spending $4 every few weeks or so. Back issues tend to go for a bit cheaper, too.