Altona DP300 is a Mini DisplayPort to HDMI Converter

This is the Altona DP300, and it is designed to be a converter for audio and video signals from HDMI sources for Apple Cinema Displays and iMacs.

So if you if you want to watch Blu-ray movies or play video games on an Apple LED Cinema display, this is your device to do it with.

You should be able to get the Altona DP300 for an MSRP of $149.