As one of its daily deals, All4Cellular offers the refurbished LifeProof Case for iPhone 4 / 4S in Purple/Black, Black, or White/Grey for $19.95 with free shipping. (HeightsMobile via eBay has it in black for pennies more.) That's tied with our refurb mention from two weeks ago and $9 less than the lowest total price we could find for a refurb elsewhere. It features 6.6-foot drop shock protection; it's also waterproof to depths of 6.6 feet. Deal ends today.

Note: A 90-day All4Cellular warranty applies.