There are 15 copies available as I typed this. This is the 3rd batch for the game. I own the game, and I can tell you it is a very good version of burgertime. The 7800 version of Burger time is called "Beef Drop.
Here is the link to the product to purchase it: http://www.atariage.com/store/index....roducts_id=830
The link has pictures to the game also.