A4C via eBay offers the refurbished AT&T Zero MicroUSB Travel Charger 2-Pack for $2.97 with free shipping. That's tied with last week's mention and the lowest total price we could find by $7. They each include a USB to microUSB charging cable.
A 90-day A4C warranty applies.
If you're at least 62 years old, you can score a $10 lifetime pass to America's federal parks and recreational lands. But act quickly because fees are about to jump.