Meritline offers the Trident Cyclops Case for iPhone 4 / 4S in Yellow, model no. CY-IPH4-V-YL, for $9.99. Coupon code "MLC323DN" cuts it to $5.99. With free shipping, that's tied with our expired mention from four days ago and the lowest total price we could find in any color by $4. (We saw it in orange for $1 less in January.) It features impact-resistant polycarbonate construction, a shock-absorbing silicone outer ring, and more. Coupon expires after 500 uses.