Pricerunner is not great, but I'm in the same boat. I find myself using it more and more, because it's pretty much the only good way to find product while filtering out the most ridicules storefronts, like Fruugo or VidaXL, at least in Denmark.

I switched to Ecosia two years ago, from DuckDuckGo, and I really don't find myself going back to Google all that often. There are some search there I figure that something should have shown up, but mostly Google can't find it either.

Ecosia started mixing in Google results a few months ago, but I don't feel like it improved the results, if anything it's perhaps a little worse. That's anecdotal and not based on any actual tests though.

Kagi does look more and more interesting, because the issue seems to be the focus on ads and pushing stuff for people to buy. I just feel like Ecosia should be doing more to limit purchasing, given their environmental focus.