I have one of the first of the aid D-18's purchased from MFG at the beginning of last year. It was great from the start and is now really coming into it's own.
Not wanting to make it too easy for you, here's another option I just came across you might want to keep an eye on. (no connection to seller)
http://cgi.ebay.com/ws/eBayISAPI.dll...tchlink:top:en