These Sam's Club items basically make a membership pay for itself. We did the math.

Sam's Club offers a unique option to scan items on a mobile app and walk out of the store without stopping for a receipt check.

Dominick Reuter/Business Insider

• Sam's Club is a Walmart-owned warehouse store that offers bulk buying at the lowest unit prices.
• Accessing the deals requires an annual membership fee of $50.
• We did the math to see whether the savings can effectively offset the fee, and by how much.

Shopping at Walmart is one way to save money, but...