Consignmentshop

Consignment shop retailers get a percentage of each item sold.

Source: Ehow

"Consignment shop" is an American English term for second-hand stores that offer used goods at a lower cost than new. Many offer new items as well.
In the context of sale, it is usually understood that the consignee (the seller) pays the consignor (the person who owns the item) a portion of the proceeds from the sale. Payment is not made until and unless the item actually sells. The consignor retains title to the item at all times, and can end the arrangement at any time by requesting return of the item. A specified period of time is commonly arranged, after which time if the item does not sell the owner can reclaim the item (or, if not reclaimed within a period of time, the seller can dispose of the item at his discretion).
Merchandise often sold through consignment shops include antiques, athletic equipment, automobiles, books, clothing (especially children's, maternity, and wedding clothing which are often not worn out), furniture, firearms, music, musical instruments, tools, and toys.

eBay drop off stores often use the consignment model of selling.

Art galleries, as well, often operate as consignees of the artist.

Consignment shops differ from charity or thrift shops, in which the original owner surrenders both physical possession and legal title to the item as a charitable donation, and the seller retains all proceeds from the sale.

In the UK, the term "consignment" is not used, and consignment shops selling women's clothing are called "dress agencies". Although the other types of consignment shop exist, there is no general term for them.

Source: Wikipedia