Meritline offers the 4-Port USB Charger Adapter for Mobile Devices (pictured) for $6.99 with free shipping. That's tied with our May mention and the lowest total price we could find for a comparable charger by $3. It works with most electronics that use a USB charging cable. Expect this item to take two to three weeks to arrive.
Have Amazon Prime? Galactics via Amazon offers Prime members the SCOSCHE reVIVE IV 4-Port USB Charger for $5.97 with free shipping. (Non-members can spend $25 or more to qualify for free shipping; otherwise, shipping costs $5.58.) It's the lowest total price we could find by $4.