Some ideas about the best and least expensive places to obtain laboratory chemicals, including local sources and on-line vendors from whom I've ordered and found to be reliable.

Seattle Pottery Supply: http://www.seattlepotterysupply.com

Elemental Scientific: http://www.elementalscientific.net

HMS Beagle: http://www.hms-beagle.com

MakerShed: http://www.makershed.com

Home Science Tools: http://www.homesciencetools.com