As one of its daily deals, Yugster offers the Absolute Linkase WiFi Signal Booster and Protective Case for iPhone 5 in five colors, model no. AI53FWFG1, for $19.97. Coupon code "facebuck" cuts it to $18.97. With $3 for shipping, that's the lowest total price we could find by $11. This non-slip leather case purports to improve WiFi signals by up to 50% and features 360-degree reception. Deal ends August 29 at 6 am ET.