How to time a purchase using price history
A price on its own tells you nothing. The shape of its history tells you whether to buy now or wait.
A price on its own is just a number. The shape of that price over time is the actual information, and it is the one thing a retailer's product page never shows you. Learn to read it and you can tell, in a few seconds, whether to buy now or wait, which is the difference between a genuine saving and a price that simply looks like one.
What a single price hides
On a retailer page you get today's price and a crossed-out was-price, and no way to know whether that was-price is real or whether the item has quietly sold for less for months. The history fills that blank in. It shows what the item cost last month, what it dropped to, how long each price held, and whether today's "sale" is a genuine low or just the standard price under a fresh sticker. Without it you are deciding on a single frame of a film and trusting the retailer to describe the rest.
Reading the line
Three shapes cover most of what you will ever see, and each one means something different.
A flat line that suddenly wears a sale badge usually means the standard price has a new sticker, not a markdown. The price did not move; only the marketing did. A clean step down, holding steady at the new level, is the signature of a genuine price cut, especially when the item has sat at the lower price for a while rather than for a day. And a spiky line that jumps up just before a "sale" is the giveaway of an inflated anchor: the spike is the number the badge is calculated from, and it exists to make the drop look bigger than it is.
The buy signals
Buy when the current price is at or near the lowest we have recorded and clearly below the price the item usually holds. That combination, a real low and a real gap, is what a genuine deal looks like, and it is rarer than the badges suggest. Right now we have 143 items sitting at exactly that point, each one at a recorded low with a meaningful saving against its usual price. Those are the buys the history actually supports.
The wait signals
Wait when the price is above its recorded low, when it has only just been marked down from a long flat run, or when it is drifting back upward. The first cut in a markdown cycle is rarely the deepest, so on anything that is not size-sensitive, patience usually pays. A price that has been falling in steps often has another step in it. Most items that go on sale go on sale again, so waiting costs you little except the item itself, and only if it sells out in your size.
When timing matters less
Some buys are need-driven and cannot wait, and that is fine. A broken kettle does not care about the markdown cycle. Even then, the history is worth a glance, because it tells you whether you are paying a fair price or a flattering one before you commit. Knowing you paid a little over the odds because you needed it today is a different thing from being talked into it by a badge.
Building the habit
The practical version of all this is simple. Before you buy anything that is not urgent, look at the shape of its price, not just the number. Is it at a recorded low? Is it clearly below the usual price? Has it just started falling, or has it bottomed out and held? Those three questions take ten seconds once you are used to them, and they are the difference between buying a deal and buying a sticker.
How to read one of our price charts.
Figures on this page are calculated from our own price tracking and update as we record new prices. We do not invent price drops or savings.