I really like the idea behind this site and the goal of finding best deal across the web.

But what you said is exactly what my buddy and I have felt. Google Shopping also injects all these advertisers who have similar but different products. There isn't a good place to just say "Here's the exact product I want, now find it for me for the best price" that we've found.

We built and use https://www.lowlow.bot for price tracking specific item urls. Next we were thinking of doing it across sites just like you described, so it's good to hear from someone else who prefers that.