GarageSale is a WordPress plugin by leo.eibler that enables users to put their stuff with a picture, description, price and contact on a wordpress site. The users are wordpress users with access right Subscriber (so every registered user can use the garage sale).
Put the string “[GarageSaleList]” on any page or article post where you want to display the list of sale items.
This Plugin creates an own subfolder within the upload folder for the pictures.
Plugin homepage: http://www.eibler.at/garagesale/