I have to admit, Amazon would be a hard one for my family to give up. This shows the danger of monopolies. Amazon also owns the formerly great Abebooks (used books). Amazon and Barnes and Noble are probably 85% of the market. I guess Books-A-Million is an option for books.
I was shocked, unbelieving and then cynically accepting when ABEbooks was taken over by the evil Amazon.
An old SF novel by the socialist American Frederik Pohl had something like “food” , “fuel” etc. left as conglomerates monopolized everything. I thought it was so stupid I didn’t read the novel (JEM).
In later years I keep seeing it true (Kraft and a few others have all kinds of food items, ——Look at the list of Gillette items —not simply for shaving but lots of stuff-—and even my eye drops were taken over by their competitor recently).