I use the Whenpricedrop.com, works well.

Honestly just use Honey. It's not exclusively for Amazon, but it works great there and can automatically apply coupons at checkout. For laptops, I've found their price history tool super helpful to know if I should wait for a better deal. Plus it's completely free and the extension is easy to use.

Tbh it looks like the thread has covered the big hitters like Keepa and Honey pretty well. Basically, it comes down to whether you want a simple interface or a deep dive into price graphs. One thing I'd add from a technical perspective is to be really cautious about 'fitment'—meaning the exact specs of the model being tracked. Laptops have so many sub-variants that look identical but have totally different internals, and sometimes trackers get confused between new and refurbished listings. Quick tip: When you're using these tools, always track the specific ASIN or manufacturer part number. I’ve seen people get excited over a price drop only to realize it’s for a model with a soldered 8GB RAM module that can’t be upgraded, which is a huge dealbreaker for compatibility with modern apps. If you want something that's really precise for specific URLs, I'd suggest giving Glass It Price Tracker a look. It’s super reliable for catching changes on the exact page you’re watching so you don't end up with a 'lookalike' model that doesn't actually fit your needs. Double-check those specs before you pull the trigger! lol

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If you're tracking multiple laptops, The Tracktor is worth checking out. Clean interface, email alerts when prices drop, and you don't need to create an account. I tracked 5 different laptop models last Black Friday and ended up saving almost $300 by catching a flash sale that lasted only a few hours.

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When Price Drop, it is very easy to use.

Keepa has been my go-to for the past couple years.