Virco furnishings– colorful and fairly inexpensive but fairly typical school furnishings:
https://www.virco.com/b2c_virco/b2c/init.do
Modernised – less typical/ Eames/ Nelson designs for kids:
http://www.modernseed.com/studyspace.html?page=0&sf=&sd=#sortblock
Design Within Reach – category for stackable/less expensive chairs
http://www.dwr.com/category.cfm?subc=41
VS International – cool modular furnishings and setups especially for schools- US providers in North Carolina
