Tanga offers the PowerLine 4-Port USB Power AC Adapter, model no. 90297, for $3.99 plus $2.99 for shipping. That's tied with our mention from last month and the lowest total price we could find by $1. (For further comparison, we saw it bundled with a 2-port AC/DC car adapter for $2 more in October.) It allows you to charge up to four devices at once from a standard wall power outlet.

Need more? Add three adapters to your cart for $11.97 plus $2.99 for shipping.