Today only, JustDeals offers the Incipio EDGE Slider Case for iPhone 4 or 4S in Purple (pictured) or Blue for 77 cents plus $5 for shipping. That's tied with our April mention and the lowest total price we could find in either color by $13, outside of the price below. This polycarbonate case features a 2-piece sliding shell and is dent-, scratch-, and impact-resistant.

A close price: All4Cellular offers it in Purple for $3.95 plus $2 for shipping.