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Electronics Tutorials at www.electronics-tutorials.ws
http://www.martindalecenter.com/ This is the reference site for just about EVERYTHING
Science Supplies and Cool Toys to Buy
Archie McFee - Strange Toys and gags
Educational Innovations - A great science and science toy source
Arbor Scientific - one of my favorite science supply sites
Edmund Scientifics - a great,older company with lots of optics and new lines of stuff
I have not purchased from these sellers but they look interesting.
Explore4fun Science Toy catalog
Geek Toys - for home and office