The price is for the digital editions 1-13 (the $.99 issues listed here on the ibook store.) The issues 1-6 listed in the description are for the physical printed issues found in stores, and I beleive those were priced at $2.99 per issue.

So I can get 1 - 6 in this volume for 12.99 or individual 1 - 6 at .99 a piece. Am I missing something?