As one of its daily deals, DiscountMags offers a Macworld Magazine 1-Year Subscription (12 issues) for $21.97. Coupon code "DEALNEWS" cuts it to $9.99. That's the lowest price we could find by $7, although we saw it for $2 less three weeks ago. Deal ends today.
Of note, you can purchase up to a 2-year subscription at this per-year price.