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There is no way they'll sell an annual sub to The New Yorker for $19.99. It's a weekly mag, and the print subscription is nearly $70/yr. That rate must be in reference to GQ, etc.
$70 is the exorbitant price they quote on their website, but if you do a little digging there are ton of offers for a 1yr subscription (including from Conde Nast itself) for around $40 or even less in some cases.