For its newsletter subscribers only, EverydaySource offers the Snap-On Rubber Case for Apple iPhone 4 / 4S 2-Pack for $17.99. Coupon code "S0218IQLN" drops it to $5.29 and yields free shipping. That's $2.65 per case and the lowest total price we could find for a comparable case in this quantity by $4. It includes a black case and a pink and black case.