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This option only applies to persons with an existing subscription that has or is about to expire.
Decide how many issues you want to subscribe for. The more you buy, the cheaper it gets per issue.
1 issue $4.95
2-7 issues $4.50 each.
8 or more issues $4.38 each.
ePub is the e-book format best suited for iPad, Sony Reader, and several other types of e-reader.