Informal Selling

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/

Garage Sales Tracker
Find and advertise garage sales in the United States.
http://www.garagesalestracker.com

Go Yarding
Map-based yard sale search engine for the United States.
http://www.goyarding.com

Local Deals
Find local garage, yard, moving, estate, and rummage sales in the United States. Paid listings; free access.
http://www.local-deals.net

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 Queen
Get tips to become a smarter yard sale shopper. View forums and discussion blogs and learn from other’s experiences.
http://www.yardsalequeen.com