The recorder has been discontinued by Panasonic, and most retail stores no longer have them. The occasional unit pops up on eBay, but email the seller to make sure he really has one. Some sellers list the auction with a high reserve, then if someone wins, they try to order it -- only to find out there are none available.
Also, make sure the seller will guarantee that it WORKS. I bought one that was so broken it actually had pieces rattling around in it http://www.avsforum.com/ubb/mad.gif
Some retailers have come up with the occasional spare unit or two on rare occasions as well. I have heard reports of some Fry's stores and some Good Guys stores as well.