The one I had heard about before is Amplosion, which is currently $3. It was previously discussed on HN. [2] Another cheaper option, with good ratings but many fewer of them, is Overamped. [3]
Hyperweb [4] offers a multi-function extension that blocks AMP and does many other things. It's free to download, though I think they may start charging for some features (hopefully not this one!) at some point. They're a YC company and there are some HN-specific features as well.
