Costco sued J&J Vision Care a few years ago over anti-consumer behavior in the contact lenses industry (I characterize it as anti-consumer. The Vision Care industry characterizes it as pro-consumer). They dropped the lawsuit in 2016, probably because Johnson and Johnson discontinued the practice: https://www.law360.com/articles/800034/costco-drops-antitrus...
Costco did support a different lawsuit by state of Utah against Contact Lens Manufacturers. The Manufacturers lost their first appeal in December 2016: http://www.sltrib.com/news/4731439-155/contact-lens-makers-l...
Hopefully this will begin reducing the prices of contact lenses. Kudos to Costco for sticking up for its customers.
Here is one manufacturer's opinion on this matter: https://www.alcon.com/content/unilateral-pricing-policy