“An engineer explained to us that hundreds of ear impressions were gathered in the name of research, and while each one obviously boasted its own unique shape and size, one single characteristic remained uniform across the board: the entrance into the ear canal is not a perfect circle, it's an oval.”
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Radio Shack is selling the Zenith DTT900 for $59.99 according to http://www.ezdigitaltv.com/Converter_Box_Retailers.html. There is a small list on that page of other boxes, where they are sold and how much.
you might check out the Echostar TR-40 at http://sats.client.shareholder.com/releasedetail.cfm?ReleaseID=284881
I am told that they will be released in June or July.
You might also look at http://www.indybooks.net/DTV/ at the bottom of the page is a list of currently approved CECBs.