Like someone mentioned, Keepa is definitely the gold standard for data, even if the charts look like a bowl of neon spaghetti at first. I have been super happy with how it handles those crazy Amazon price swings tho. Last year when I was hunting for a new grinder, I almost pulled the trigger way too early because the original price was a total lie. I started using this Chrome extension to cross-reference things and it saved me nearly eighty bucks. Quick tip: dont just watch the main price line. Those clippable coupons often appear right before a big sale to test the waters. If you set your alerts to ping you just a little bit above your actual target price, you will have time to jump in and check for those extra discount boxes manually. Honestly, for a one-time kitchen upgrade like the Breville, paying for Keepa premium is total overkill... the free version works well enough.

In my experience, Keepa is the way to go if you want the full picture, even if the UI looks like a total mess. Ive tried many tools over the years and most miss those clippable coupons that actually give you the lowest price. Dont waste money on the paid version for just one purchase though, its overkill. Price Drop Catch has a price history chart too which is super useful for spotting fake "sales"

Re: "In my experience, Keepa is the way to..." I totally agree on the data density. Keepas scrapers have a much higher refresh rate than Camels, which is why they catch those blink-and-you-miss-it drops.

• Most trackers struggle with clippable coupons tho because they need a logged-in session.
• Check if this extension handles the API calls better for your region. Are you looking for New condition only, or would you consider tracking Warehouse deals too?

Building on the earlier suggestion about Keepa being the data king, you definitely gotta be careful with how you interpret those specific price spikes. Honestly, even with the messy charts, Keepas refresh frequency is the only thing I trust for high-volatility gear like the Barista Express. I would suggest looking at the 'New' vs '3rd Party New' lines separately tho, because those 3rd party sellers love to inflate the 'regular' price to make a tiny discount look like a massive steal. Ngl, those clippable coupons are still the bane of my existence since they rarely show up in the historical API data perfectly. Make sure to double-check the 'Used' price history too... sometimes a 'Like New' warehouse unit drops way below your $500 target and it is usually just a damaged box. I usually use Cart To Link to send my cart over to my brother to see if he can find a better stackable coupon on his account since prices can vary by user sometimes. Just keep an eye on the 'buy box' history too, thats where the real games are played... it tells you who actually has the stock at that price.

Like someone mentioned, Keepa is the big name here, but I have had such a disappointing experience with these tools recently. I spent nearly half a year waiting for a specific espresso machine to drop, only to find out that my tracker completely ignored a 20 percent off clippable coupon that was active for two days straight.

• CamelCamelCamel is unfortunately just too basic for high-end gear. It misses those quick price pivots that happen during the middle of the night.
• Keepa has become such a chore to use since they started paywalling the useful features. The charts are accurate but the UI makes my eyes bleed.
• Most of the newer extensions are just bloated and dont actually handle the weird way Amazon hides discounts in those tiny checkboxes. Its honestly exhausting. If you are doing research across multiple sites or sharing a list with someone, Cart To Link is a solid way to keep your finds organized without losing your mind. But for the Barista Express, you basically have to check manually every morning because the software just isnt as good as it used to be.