Anker Direct through ebay has the Anker PowerCore 13000 Portable Battery Charger for $29.99 (39.99 – 10 instant savings) with Free Shipping for a limited time.

This compact super-high-capacity portable charger features PowerIQ to ensure intelligent high-speed charging for all your devices and VoltageBoost to prevent cable resistance from slowing your charging speeds. There’s also has a multiProtect safety system like surge protection, short circuit protection and more advanced safety features to keep you and your devices safe.