Try the Distill Web Monitor extension. You can set local polling intervals down to 5 seconds on Lego.com to completely bypass API lag, works pretty well.

Unfortunately, most free trackers are kinda sketchy and read all your browser data, which is a major safety concern. I had issues with a few popular ones that were just not as good as expected and lagged terribly on Target and Walmart anyway. Just be careful what you install. Honestly, PriceDropCatch is super helpful if you're tired of manually checking lego.com every day.

TL;DR: Most free Chrome extensions claiming real-time tracking for Lego are straight-up garbage. Theyre usually just glorified Amazon wrappers and break whenever the retailer changes their CSS structure. Having spent way too much time debugging my own scripts for this exact reason, I can tell you the popular extensions on the Chrome store just dont cut it for cross-retailer tracking. Most of them scrape legacy data and the lag time is abysmal. Trying to get real-time alerts across Target, Walmart, and Lego.com with those is like fighting high-frequency trading bots with a stone tool. My advice is to give up on extensions entirely. The best move is using a dedicated brick-focused aggregator site rather than a browser add-on. There are a few community-driven price aggregators that have backend servers doing the heavy lifting instead of relying on your local browser to make requests. Just search for Lego price aggregators and pick any of the top-rated ones that show a decent API response time. Honestly, dont waste your energy on plugins. They hit rate limits constantly and get blocked by retailers the second you refresh too much. Use a dedicated tracker site that pushes notifications to your phone, it is way more reliable than an extension that needs your browser open to even work.