Zinio offers $50 in Zinio Bucks for free, good for 18 single issues or 6 mini-subscriptions. That's tied with our January mention as the best such offer we've seen from this digital newsstand service. When you enter your name and email you'll receive a unique code; click here to redeem your code. (It can only be redeemed via the Zinio web store; it won't work if entered via the iOS or Android apps.) Deal ends June 30; credit expires August 8.