Cloudy Nights Classifieds
- Classified listings of used telescopes, accessories and observatories for sale.
- http://www.cloudynights.com/classifieds/

AstroAds
- Buy and sell equipment and accessories.
- http://astroads.com

ScopeTrader
- Reflectors, refractors, mounts, cameras, scope building, eyepieces, and observatories.
- http://scopetrader.com/?l=/Classifieds/allview.asp

Astronomy Pinboard
- Accessories, software, observatories, binoculars, telescopes, components, photo equipment, and miscellaneous items.
- http://pinboard.astroinfo.org/

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

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

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

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