How prices and deal signals are calculated.

The tracker reads structured prices on publicly accessible retailer product pages when automated access is permitted. It also accepts authorised retailer feeds, affiliate network feeds and product APIs. Every published offer identifies its retailer and checking time. A retailer is not excluded merely because its link earns no commission.

Offers are matched using the product slug, model number, manufacturer code, barcode, brand and exact title. Ambiguous or low confidence matches are rejected. Capacity, colour and pack variants remain separate when they are not directly comparable.

Observed item prices are stored over time after the listing passes the same product identity and quality checks used for current offers. The 30 day average uses eligible daily low observations, while the 90 day low is the lowest eligible daily price in that period. Delivery is excluded from the history because it is not consistently supplied by every retailer.

A current item price is labelled Lowest recorded when it matches or beats the eligible 90 day low. Good price means it is at least 5 percent below the recent 30 day average. Typical price is within 10 percent above and 5 percent below that average. PriceSignal waits for at least three daily observations before assigning a rating.

Current offers are ranked by the available total. That means delivered price when the source supplies delivery, or item price when delivery is unknown. Every unknown delivery cost is labelled, and affiliate commission never changes the order.

Every current listing must pass destination, model, pack, capacity, colour, condition and availability checks. An implausibly low price is held back when no nearby retailer corroborates it, including extreme gaps against the next retailer or the middle of a three retailer market.

A retailer must be classified before its offer can be published. Known marketplaces are labelled separately because the seller, dispatch location and warranty can vary. Unclassified sources remain quarantined until their identity and Australian fulfilment are reviewed.

The offer confidence score combines exact model match confidence with retailer classification and delivery quality. It does not measure product quality or guarantee the retailer experience.

A deal requires two current offers for the same model and comparable variant using the same delivery basis. Large gaps involving a marketplace require another offer supporting either price range. Affiliate commission does not increase a score.

Retail prices can change quickly. If a price, product match or availability record appears wrong, contact us with the page address and retailer evidence so it can be reviewed.