The National Retail Federation says Americans returned $743 billion in merchandise so far this year.

Delivery giant grows its network of sites where customers can send back packages by adding 10,000 Happy Returns drop-off locations.

Everyone from publicly traded companies to individuals working out of their garages are buying and reselling liquidated items.

Optoro, which manages returns for Target and Ikea, says consumers will send back $120 billion worth of goods this season.