Frisbees
Checkers and checkerboard (I just kept a little boy who is in kindergarten and with all the toys I had at my house, that was his favorite!)
Toy airplanes (the kind we used to have as a kid)
As someone else suggested, look at Oriental Trading and you can buy a lot of things in bulk.
And you'll be surprised at how your local McDonalds and other restaurants will pony up $1.00 certificates.

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"GO HOKIES!"