Game and Watch Donkey Kong
Yeah I was going to be clever and mention that you can now get this in the US via Club Nintendo, for the DS. It includes three original 'Game and Watch' titles, of which, Donkey Kong was the one I had as a kid.
Register your DS or Wii games to get gold coins, then you can redeem them for weird Nintendo related shwag. The games come with a printed serial number. Remember to stop and look at all those health warning flyers that you normally throw straight away, and other useless little pieces you get, as the codes are on the back of one of them (somewhere).
Complete a survey, get coins. Do enough surveys, cash in your coins, get stuff.
I don't have enough coins for this particular trip down memory lane... yet.