I have had great luck finding toys and games at garage sales. Some games can be made or created by the students. This is just a brief list to get you started. The possibilities are endless.
Balloons*
Bean bags
Bubbles
Clapping hands*
Hula hoops
Jacks
Kazoos*
Paddle balls
Pick-up sticks
Puppets
Makeup and dress-up costumes
Mood rings
Mr. Potato Head
Play money
Rubik's Cube
Slide puzzles
Slinkies
Squish balls
Spinning tops
* recommended for group use