Shop4Tech offers the Macally Glow-in-the-dark Case for iPhone 4 / 4S in Black, model no. LUMT, for $24.99. Coupon code "GIFT15" cuts it to $21.24. With free shipping, that's the lowest total price we could find by $6. (We saw a similar case for $5 less in October.) This glow-in-the-dark hardshell case features rubberized edges, access to all connections and controls, and more. Coupon expires December 25.