LEGO lowest price of the last 30 days: is this promotion real

What the 30-day lowest price is

It is the lowest price at which a product was offered during the 30 days preceding a discount. The store must display it next to the new price for every promotion. The obligation comes from the Omnibus Directive, in force in Poland since 1 January 2023.

The purpose is straightforward: without it a store could raise the price a week before a sale and then announce a deep discount off a price nobody ever paid. A 30-day reference price removes that option by moving the comparison point back before the increase.

The catch sits with the buyer: the rule requires the store to publish a number, but gives no tool to verify it. Verification needs an independent price history. That is exactly why we keep one.

How we check the claim

For every set we record the lowest offer across all tracked stores, once a day. Those days form the reference window: the 30 days before today.

We only count representative days, meaning days with genuine competition between offers. A day carrying a single expensive offer can inflate the reference price so much that any price today looks like a record. A set enters the measurement only with at least 20 such days.

We compare today's lowest price against the minimum of that window. Separately we count offers that look discounted by at least 10 percent against the catalogue price, yet do not go below their own 30-day minimum. This is not an accusation against any store: the legal reference price is computed per store, while we observe the market. It measures how often the word "promotion" does not mean a new lowest price.

What the data shows today

The numbers are recomputed daily, because the 30-day window moves with every day. They are not written into this page.

In other words: 89 percent of the offers that look clearly discounted against the catalogue price today are not cheaper than the same offer was at some point in the last 30 days. Catalogue price and reference price are two different things, and a discount computed from the former need not mean any real price cut.

How to check it yourself

Open the page of the set you are interested in. Every set page carries a price history chart across all tracked stores plus a flag telling you whether today's price is an all-time low or merely a recent one.

If today's price sits clearly below the line of recent weeks, the cut is real. If the chart shows the same price a month ago, the advertised discount says more about the reference price than about the deal.

The second step is comparing across stores. The same set can carry prices differing by tens of percent on the same day, so the deepest percentage discount and the lowest actual price are often two different shops.

What this method does not show

We do not see the reference price declared by the store. We see our own market observation, the lowest offer per day. These are two different numbers and we compare them deliberately: ours tells you whether today's price is genuinely low, not whether a store computed its own declaration correctly.

We exclude sets that entered sale within the last 30 days, because they have no reference window yet. A newly released set on promotion always needs judging on other grounds.

We do not assess the legality of any offer. Enforcement belongs to the competition authority, not to a price comparison site. This page shows data and method so you can judge an offer yourself.