You can buy their products direct from the factory. Also eBay usually has one or two new HD300`s available at a even better price.

http://www.mpioamerica.com/mpio/productInfo.html?productId=11

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=5790648203&category=67841&ssPageName=WDVW&rd=1