Zapper + duckhunt

Quick question, how much would this version of duckhunt be worth?

http://img41.imageshack.us/img41/1002/duckhunt.png

I dont think it is worth that much, I see a lot of these on Ebay, like here:

NES Zapper NEW Duck Hunt Mario Bayou Billy Nintendo - eBay (item 330379527465 end time Dec-13-09 08:01:16 PST)


though yours does look like its in very nice condition

Alright, thanks