Other universities don't know, but there are two undergraduate economics textbooks to choose from.

When I was in class, I was N. Gregory Mankiw (author) of Principles of Economics. At that time, the price was 190 USD, which was very expensive.

Now my younger brother is studying economics. Paul Samuelson and William nordhaus (the author) don't know the price.

When studying economics in the United States, Man Kun and Samuelson were basic readers, and Friedman was also a minority in universities. Both Stanford and Princeton are studying Man Kun. They must be the best-selling economics textbooks.

I suggest you look at these two sides first, almost. If you have time, you can also read the Chinese version, which is good for your undergraduate study.