Amazon offers the OtterBox Defender Series Case for Apple iPhone 5 in Bolt (pictured) with prices starting at $33.88 with free shipping. (Click "Add to Cart" under "More Buying Choices" at the right to see this price. It's also available in nine other colors for slightly more.) That's the lowest total price we could find in any color by at least $2, outside of the price below. It features access to all ports and buttons.

Of note, SF Planet via Buy.com offers it in Black for pennies less.