All4Cellular offers the Ventev UltraTHIN Hard Shell Case for iPhone 4 in Pink for $1.95. Coupon code “A4C20″ drops it to $1.56. With free shipping, that’s $2 under our mention from last February (in blue) and the lowest total price we could find by $3. This razor-thin plastic shell snaps on to your iPhone 4 to protect the back from bumps and scratches.