solids from a man who hand carves them in Japan.
He does actually sell these to schools in Japan. I am
saving up for a set...
Montessori World has a presentation on geo solids
(more than the usual set) here: http://homepage.mac.com/montessoriworld/mwei/sensory/sgeosoli.html
Paper models of solids would be fun to make either from
cut outs or oragami. Check these resources out from Dover Book: