Shop4Tech.com has this Mini DisplayPort to HDMI Video Adapter discounted from $12.95 to $6.95, and code SUMMER drops the price to $5.91. With free shipping, that is the lowest price we could find for this adapter. This adapter works with Apple laptops made after 2008, as well as many newer models of PC laptops. It allows you to connect a laptop to an HDMI external device like a TV. This means you can view your computer screen on your HDTV. There is no sales tax (except CA).