We already knew there is a problem with Zune 80 as it is out of stock in most stores. The story is Microsoft doesn't have enough Zune 80 units yet as the product is 6 weeks behind schedule. More will be sent to retailers in the first half of December. If you really want one you may have to search across USA to get it :) ...
Personally I don't understand what kind of marketing strategy this is. No official announcements about it all these days. (An exception is ZuneOriginals.net where it says Zune 80 will be available on early December).