I now have a policy of using Amazon third. If I can get the thing I want directly from the manufacturer, that's best. If I can get it from some some less dominant vendor at a reasonable price and schedule, that's fine. Otherwise, Amazon.
Doing this for a while has increased my concern about Amazon, as a surprising number of things are only available from them.
By instead having smaller companies/ local book shops, who don't treat their workers like shit (like not forcing them to pee in bottles because they cannot have breaks etc) and also are better for the environment (in my country - France - Amazon was caught regularly destroying tons of unsold goods because it was cheapest to do this that sending them back to the original seller).
Hard to imagine in the current context of western countries, where the incentive is for publicly traded companies to try to only focus on making as much as money as possible and having products as cheap as possible, with no real incentive to treat lowly qualified workers which are easy to replace decently, or to care for the environment. We need laws to make the right incentive, which we have some in France, but reality shows that it's far from enough.
Doing this for a while has increased my concern about Amazon, as a surprising number of things are only available from them.