What is the relationship between Office Depot and office supply in the context of the input sentence. Choose an answer from: product/material produced; manufacturer; distributed by; industry; position held; original broadcaster; owned by; founded by; distribution format; headquarters location; stock exchange; currency; parent organization; chief executive officer; director/manager; owner of; operator; member of; employer; chairperson; platform; subsidiary; legal form; publisher; developer; brand; business division; location of formation; creator.

You’ll find sales at big-box retailers such as Target and Walmart and office supply stores such as Office Depot and Staples, which is matching competitors' prices and discounting 10 percent of the price difference.

Answer: product_or_material_produced