Tensun via Amazon offers its Tensun International Travel Plug Adapter with 4 USB Charging Ports in Black for $14.99. Coupon code "NYZV4AU3" drops it to $10.99. Plus, Prime members receive free shipping. That's a buck under our April mention and the lowest price we've seen. (It's the best today by $10.) Deal ends July 31.

Features include four built-in plug standards (US/EU/AU/UK), four USB charging ports (two with smart charging), and a slide-out plug release button.