Adventure Time is so popular it has it's own DVD section at Amoeba music on Sunset
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Adventure Time Vol. 1 Mathematical Edition
You can now purchase the hardcover of the first arc of the Adventure Time comic. The net hardcover will features Jake. It comes with an extra section featuring the variant covers and mini comic on how it's made. You lose all the short comics found at the end of the comic. They'll probably be collected in there own collection.
Earl of Lemongrab Feat. Will Sasso