Given the input sentence, please extract the subject and object containing a certain relation in the sentence according to the following relation types, in the format of "relation1: word1, word2; relation2: word3, word4". Relations include: 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: Office Depot, office supply