[ecaron]

We do this at my company, https://trackif.com. More than products (for instance we'll track rubygems, npmjs & github). I just haven't gotten off my butt to write a blog post about it since I figured "price tracking" wasn't a topic that'd interest the HN community.

[ThomPete]

There is no topic that isn't of interest to the HN community as long as it expands our knowledge.