Best Buy via eBay offers the Microsoft Wireless Display Adapter, model no. CG4-00001, for $39.99 with free shipping. That's the lowest total price we could find by $5. It's compatible with Miracast-enabled Windows 8.1 devices and Miracast-enabled Android devices with v4.2.1 or later. This adapter complies with 2.4GHz and 5.0GHz 802.11n wireless standards, so you can easily mirror content from your compatible device on an HDTV or monitor.