The same device can carry several different prices across retailers on a single afternoon. The spread comes from how each seller acquired the stock rather than from any difference in the product.
Retailers buy at different moments
Stock is purchased in batches, and the cost of a batch reflects the negotiated terms on the day it was ordered. Two retailers holding identical devices may have paid different amounts.
A seller who bought early at a higher cost has less room to discount than one who bought during a later, cheaper allocation.
Neither is being unreasonable. They are working from different cost bases toward the same target margin.
Promotional funding is not distributed evenly
Manufacturers support selected retailers with promotional allowances, marketing contributions or temporary price protection. Those arrangements are negotiated individually and are not public.
A retailer receiving support can advertise a lower price without absorbing the difference, because part of the reduction is being funded upstream.
This is why an apparently identical product is cheaper at one chain for a fortnight and then cheaper elsewhere once the arrangement rotates.
Inventory position drives urgency
A seller holding more units than expected has a reason to cut prices that a seller running low does not share. Stock levels differ by region and by how well earlier promotions performed.
Because those positions change constantly, the cheapest retailer for a given item changes too, often without any announcement.
Price tracking works precisely because these movements are frequent, mechanical and largely independent of one another. A retailer sitting on excess stock will discount regardless of what the manufacturer suggests, and a retailer nearly sold out will quietly let its price drift upward instead.
Online pricing responds automatically
Many large sellers adjust prices with automated systems that watch competitors and adapt within minutes. A single change can propagate across several retailers in sequence.
The systems follow rules about margin floors and matching behaviour, so prices converge and then drift apart repeatedly during a day.
What looks like a flash sale is often one retailer's algorithm reacting to another's, with no human decision involved at any point.
What the spread means for a buyer
Because the variation is mechanical, checking two or three sellers before committing captures most of the available difference without extended searching.
Price-match policies convert that check into leverage, since a documented lower price at a competing retailer is the evidence such policies require.
The spread also warns against treating any single retailer as reliably cheapest, because the conditions producing today's advantage rarely survive the month.