The foundation
Price tracking starts with what you actually paid.
When you buy the same items every week, a few cents of silent creep on beef, packaging, or produce can add up faster than a spreadsheet catches it. The invoice is the line-item evidence—not last quarter's quote or a remembered price.
Operators often begin by comparing PDFs side by side or logging changes in a workbook. That works until invoice volume grows and product names, units, fees, and discounts stop lining up cleanly.
A durable workflow turns each new bill into comparable unit-cost history, then surfaces the movements that are large enough to review, renegotiate, or reprice.
ItemQtyUnit costTotal
Organic Sunflower Oil 5LSKU 15873
12$23.40$280.80 This line changedKeep the source close. A price-change number is only useful when the supplier, date, item, quantity, and invoice stay attached.