A vinyl record price tracker for Amazon. It monitors hundreds of titles every hour, stores the full price history, and surfaces real deals — not just when Amazon slaps a red banner on the listing.
Every hour, a crawler visits each tracked product page on Amazon and records the current price with an exact timestamp. That value goes into a database alongside the date and time of capture.
With that history, we can calculate real averages and minimums — not estimates, but values based on prices the site has actually recorded over time. That history is what powers deal detection.
The full history is visible in the chart on each record page, with the recorded minimum and maximum annotated. That way you can see whether that “discount” is real or the price has always been there.
A low price isn't enough on its own — it has to be low relative to that specific record's own history. A vinyl that normally costs $35 at $28 can be a great deal. The same discount on a record that swings between $20 and $50 means nothing.
For a record to show as a deal, two conditions must be true at once: the current price must be at least 10% below the 30-day average and the drop in dollars must be at least $2. This prevents tiny cent-level swings from triggering false alerts.
Price is at least 10% below the 30-day average and has dropped by at least $2. The baseline condition — confirms a real discount against recent price behavior.
Everything in Good Deal, plus the current price is also below the 90-day average. This second filter only applies when the record has enough history — at least 30 data points and 45 days of data — so when it appears, it's a more reliable signal.
The current price equals or is very close (within 2%) of the 30-day lowest price. When this happens, the record is at the bottom of its recent range — regardless of the average. This is the strongest badge.
Records with limited history get more conservative badges or none at all — the system prefers to stay silent over signaling incorrectly.
Every record page includes a chart showing price over time. Hover or tap to see the exact value at each date. Green and red dots mark the recorded minimum and maximum for the period.
Example: 30-day price trend for a vinyl record