Couldn't live without Amazon. We buy almost everything there and do find them to be cheaper on most. I also like the free shipping. Not really free - you have to belong to Prime, but its substantially less.
We don't buy food but our cleaning woman does and swears by it. We don't buy packaged food though so our choices are limited. Also don't use the video streaming because of where we are, rural, limited data, yadda yadda.
Just bought robes and jeans - much less expensive. Always buy shoes there. Socks. Art supplies. lOts and lots of art supplies. And hobby stuff. Just trying to think of the stuff we've bought recently.