Costco Canada dumping American Express for MasterCard - National

MasterCard Canada has reached an agreement with Costco Canada, which will end its 15-year-old relationship with American Express on Dec. 31.

Costco, PDF, Costco

Costco set to replace American Express in US stores - National

Costco Wholesale Corp. Path to Purchase Institute

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What you need to know when Costco ditches Amex - CBS News

BIN List & Range for MasterCard, Visa, Amex, Diners, Discover, JCB, CUP

Sam's Club or Costco: Which is better? – Orange County Register

How Bad Will It Get for American Express?

Sam's Club or Costco: Which is better? – Orange County Register

Costco dumps AmEx in major shift in credit card industry (Video) - Sacramento Business Journal

What It's Like to Visit Costco Store in Canada, How It Compares to US