Utilize the input text as a context reference, choose the right relationship between Costco and retail from the options. Options: 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.

In July 2013, Qsymia became available in retail pharmacies through approximately 8,000 Walgreens, Costco and Duane Reade pharmacies nationwide.

Answer: industry