Campus111 via eBay offers the Gooloo Qi Charging Stand for Samsung Galaxy S6 / S6 Edge, model no. MC-02A, for $12.99 with free shipping. That's the lowest price we could find for a similar unit by $2, excluding other eBay vendors. It's compatible with Qi-enabled devices or devices equipped with Qi-compatible wireless receivers.
Update: The price has increased to $13.98