Allpower21 via eBay offers two Smatree 3.7-volt 1,200mAh Battery Packs for GoPro Hero3+ / Hero3, model no. AHDBT-401, bundled with a Dual Battery Charger, Car Charger, and European Plug Adapter for $9.99 with free shipping. That's the lowest total price we could find for such a bundle by $12. The charger features a foldable plug.