Christmas Presents for 5 year old.?

I'm in need of some help. This morning my wife and I decided to do some christmas shopping for our kids. It is very hard trying to find something for our 5 year old son. He isn't into toys. In october my mother in law bought them a nintendo wii. Now my son is obsessed with wii and everything mario. Its school and mario this and mario that. We asked him what do you want santa to bring and he says Mario stuff. We told him santa's elves make toys,not electronics. We don't mind him playing once in awhile but don't want it taking over everything else. We walk him through the aisles and try getting him excited about action figures because he likes capt america,but says I don't want the toys. I don't want to spend money on items he won't show interest in and my wife doesn't want him to have video games. Has anyone experienced this? thanks for reading. I'm going crazy trying to find something. I will tell him that he isn't getting a wii game,so he'll pick up some random toy without really looking and say "okay, i'll take this one! ". We don't want that either!