Show HN: An app that alerts you when your favourite product has a price change
thewebminer.com
thewebminer.com
Would make sense to make it downgrade nicely, at the very least for the landing page.
But you could have a static landing page that leads to your single page app in the future.
Think newsletter with product price changes.
We've spent a long time establishing landing page messages so it makes sense to users as soon as they get there - otherwise they just bounce, including HN users! I've not signed up to try this out, but there is just not enough info before asking a visitor to sign up. So may want to add some info there on the value prop?
If you're in the UK (my target market), give it a go! http://salr.io/
It's less of a price alert but rather notifying you if we can get you the price you want or not.
Those 2 sites are probably the most I purchase from, however generic is nice for the other non-popular stuff!
Another cool addon is Hoverhound: https://addons.mozilla.org/en-US/firefox/addon/newzon/ I can see how low it has ever been vs just a price drop, and it prevents me from buying on newegg when it sees a lower price on amazon