You could make a target out of cardboard and cut a hole in the middle. If they miss the target they get 0 points, outer circle- 25 points, inner circle- 50 points and through the hole 100 points. They can have 5 turns each and the person with the highest score is the winner.

Pinattas are always fun, you can make your own or buy one for around $20-$25.

Guess the movie- Record snippetts of different movies (Shrek, Nemo etc) and the kids can guess the movie. No need to have a winner - its just a bit of fun.

Depending on how you feel about this one- Place a lolly or small prize in a few balloons, blow them up and tie. Blow up about 50 and have a prize in about 30 of them. Pin them to a large board. Have the kids stand a distance away and throw a dart to pop the balloon and claim their prize. Strict adult supervision will be needed for this game, obviously, and I would only use 1 dart. throw it, retrieve, and pass it on.

Hope these help!