Garage Sale Hunter
   Offering a list of sales throughout the United States.
   http://www.garagesalehunter.com/

Garage Sale Nation
   Listings for sales in the United States.
   http://www.garagesalenation.com/

Garage Sale Network
   Shares data between garage sale websites. Submit information about planned sales, create maps before a day of shopping, or download GPS data. Registration required.
   http://wiki.carterfamily.ca/tiki-index.php?page=Garage+Sale+Network

Garage Sales Australia
   Database of user-posted listings for upcoming sales, with advice and blogs about the experience.
   http://www.egaragesales.com.au/

Garage Sales Source
   Local sale listings in North America, plus articles about running sales and finding bargains.
   http://www.garagesalesource.com/

QuickGarageSale.com
   Find and post free garage sale advertisements (North American locations).
   http://www.quickgaragesale.com/

Weekend Treasure
   Online postings of North American garage sales and estate sales, associated with online maps.
   http://www.weekendtreasure.com/

Wikipedia: Garage sale
   Online encyclopedia article about informal, irregularly scheduled events for the sale of used goods by private individuals.
   http://en.wikipedia.org/w/index.php?title=Garage_sale

Yard Hopper
   Database for sales in major U.S. cities.
   http://www.yardhopper.com/

Yard Sale Canada
   Database for sales, with advice on conducting and visiting garage sales.
   http://www.yardsalecanada.com/