Calculate the real dollar savings
Compare against a credible price you would otherwise pay for the same product—not MSRP and not an inflated marketplace listing.
Estimate the travel burden
Consider round-trip distance, fuel, tolls and time. Combining the trip with other errands can change the practical cost.
Discount uncertain availability
A deep markdown with weak stock evidence should not outrank a slightly smaller saving with confirmed pickup. Confidence affects expected value.
Set a personal minimum
A shopper buying an item already needed may accept less savings than someone making a speculative trip. The tool should explain the inputs instead of making the decision opaque.