Celestron
Manufacturer of a wide range of telescopes, binoculars, spotting scopes, microscopes and accessories.
http://www.celestron.com
Meade
Meade telescopes: specializing in telescopes, microscopes, meade instruments, mead telescope, optics, digital camera binoculars, simmons optics, mead telescopes, mead, and astronomy
http://www.meade.com
Orion
Telescopes & accessories at factory-direct prices!
http://www.oriontel.com
Sky-Watcher
Sky-Watcher
http://www.skywatchertelescope.com/
Vixen
Vixen
http://www.vixen.co.jp/