When I want to search I use google or Reddit (mainly google across Reddit).
When I want to purchase I use Honey.
When I want to browse (home goods) I use shopDeft.com and switch to photo only mode.
Amazon search is so bad and has so many ads that there are multiple opportunities to do something new.
(a) don't care about the quality of, because they are either frivolously cheap or you are able to to the necessary 'QA' repairs and inspection yourself (for me these are things like circuit boards and household consumables);
(b) something you already know you want that specific thing of and the shipping speed and return policy make them the best online option;
(c) are only buying because you found it somewhere else and you didn't know you wanted it until you were told about it (deal sites like slickdeals are where I encounter this);
then amazon is fine.
Are there any that you can recommend? Google seems very unreliable in that department these days, it's very hard to say which reviews are honest and which ones are basically ads. There's also the additional complication that some sites that try to be honest receive products from manufacturers, which limits what they can say to keep their manufacturer relationships going.
More and more I've taken to just checking what Costco sells, and if Target or Walmart (or other "big, real stores") are willing to ship and sell it themselves.
Also, google "best [item] reddit"