Trigiani - $300 on Groceries? You Probably Shop Here! - Tue, May 6th 2014 by AM640 published on 2014-05-06T18:46:22Z Have you ever been able to leave a Costco without spending more than $300? Gordon Clark wrote about his recent shopping experience at a B.C. Costco where he went in for a few items, and came out with a $300 hole in his wallet. Why is the Costco model so successful? Are you a member?