[q-big]

> Amazon is unusable at this point, and I don’t get how they have so many customers.

At least in Germany, using Amazon is often the easiest way to buy copies of foreign-language (often, but not always English) textbooks about scientific topics.

[albert180]

Literally every other Bookstore has them listed too, with overnight delivery

[q-big]

My experience differs.

Perhaps the reason is that the scientific textbooks that I love to buy are often "long-tail business", i.e. textbooks about very specialized topics.

The situation is even more biased towards Amazon if we are talking about used obscure textbooks in good condition for a fair price.