Amid news that Costco (COST) - Get Report posted a 6.1% rise in same-store sales in the U.S. for August, TheStreet's founder and Action Alerts PLUS Portfolio Manager Jim Cramer thinks the retailer is a terrific company.

"Costco prices are still underneath what Amazon (AMZN) - Get Report is going to do and that's because Costco also has a card," Cramer said.

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