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While you haven't talked that much about what they need, here are some links to things that might help. (However some might be for higher levels than pre-school.) (Also, I realize that most of these things you could find yourself; I just thought it'd help you save time if a lot of the good things that are buried under the bad things were here for you.)

Math Spinner Toy - http://www.thingiverse.com/thing:185125
Deluxe Math Spinner Toy - http://www.thingiverse.com/thing:501060
Pythagorean Theorem explanation - http://www.thingiverse.com/thing:245202
Math Gears - http://www.thingiverse.com/thing:185912
Math Stacking Toy - http://www.thingiverse.com/thing:183897
A Jump Rope - http://www.thingiverse.com/thing:372103
A Pencil Shelf - http://www.thingiverse.com/thing:452177
Pencil Toolbox/Pencil Case - http://www.thingiverse.com/thing:149290
Pencil Holder - http://www.thingiverse.com/thing:149540
Boxes Collection - http://www.thingiverse.com/maot1985/collections/boxes
Organizers Collection - http://www.thingiverse.com/zwolfy/collections/organizer

Math Spinner Toy
Deluxe Math Spinner
Pythagorean Theorem
Math Gear(s)
Math Stacks - Stackable Weight Set
The Jump Rope
Pencil Shelf
by Tosh
The School Tool Box
Back To School Challenge