PC Micro Store offers a Silicone Skin Case for iPhone 4 6-Pack in six colors (Neon Green pictured) for $53.70. (Add six to your cart to see this price.) Coupon code "YMIP4GSILIALL" cuts it to $8.59. With free shipping, that's the lowest total price we could find similar iPhone 4 cases in this quantity by $3. You can mix and match skin colors. Coupon expires after 1,000 uses.