We compared Costco and Sam's Club prices on store brand products to see which is the better deal

Dominick Reuter/BI (Sam's Club); Gene Puskar/AP (Costco) Costco and Sam's Club are the leading warehouse club rivals for bulk buying. The warehouse chains' respective in-house brands are where the savings can really add up. We compared the prices of Costco's Kirkland Signature items with matching Sam's Club Member's Mark items. The world of warehouse retail has two top titans: Costco and Sam's Club. The chains have a lot in common. Indeed, they each trace their roots to Sol Price, who mento...