NetSuper-Outlet via eBay offers the Gmyle Triangular Qi Wireless Mini Charging Pad in Black, model no. NPL730068, or Black/Green, model no. NPL730050, for $7.98 with free shipping. (Amazon has it for the same price with free shipping for Prime members.) That's the lowest total price we could find by $5. It is compatible with most Qi-enabled devices.