you could hire a sciencce magician - they do all sorts of neat tricks tho i'm not sure of the cost
get the kids to dress up as a mad scientist and in the party bags put some tricks - like putty or something
you could also buy some kits (dunno if they have them in america, they do in aus) they're about 20 bucks and you could share one between 3 or 4 and the kids get to make putty - its heaps of fun! i used to love doing that when i was little
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