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/

Astronomy Classifieds  
   ATM supplies, books and publications, cameras and imaging, electronics, employment, mounts, optics, and telescopes.
   http://www.astronomy.net/cgi-bin/classifieds/classifieds.cgi

Astronomy Classified Ads  
   Accessories, cameras and photography, eyepieces, optics, telescope mounts, and telescopes and binoculars.
   http://www.amsky.com/classifieds/

Astrofieds  
   Active and archived, message board, tutorial, and FAQ's.
   http://www.astrofieds.com/

ScopeTrader  
   Reflectors, refractors, mounts, cameras, scope building, eyepieces, and observatories.
   http://scopetrader.com/Classifieds/

Astronomy Mall  
   The sale of hobby related equipment and accessories listed for free.
   http://astronomy-mall.com/