DiscountMags offers a Popular Photography Magazine 1-Year Subscription (12 issues) for $13.97. Apply stacking coupon codes "51962" and "SDK493" to drop it to $4.69. 2-Year Subscription (24 issues) drops to $9.68 and 3-Year Subscription (36 issues) drops to $14.67
Amazon offers it for $5 when you include auto-renewal.