AnkerDirect via eBay offers its Anker PowerHouse 120,000mAh Portable Outlet for $499.99. In cart, that falls to $349.99. With free shipping, that's tied with our April mention as the best price we've seen for this model. (It's also $150 under what Amazon charges.) Buy Now Features 12V car socket 110V AC outlet four USB ports
These steps will help ensure you don't outlive your money.