Astromart Everything for the astronomer including news, classifieds, auctions, articles, forums, and a calendar. http://www.astromart.com/

Canada Wide Astronomy Buy and Sell Contains new and used telescopes and accessories. http://www.astrobuysell.com/

Chicagoland Astro Ads Provided as a free service to amateur astronomers in the greater Chicago, Illinois area to post astronomy related classified ads, and shop for used astronomy equipment. http://www.stargazing.net/naa/ads.htm

Internet Telescope Exchange Classifieds Listings of telescopes and accessories for sale or trade. http://www.iteastronomy.com/classifieds/

Minor Planet Dediced to minor planets and astronomical imageing. Contains information on minor planets, building observatories and robotic telescopes and remote systems. http://www.minorplanet.org/