The Cheapest Math Book I ever bought

There aren't many garage/yard sales in Taiwan because most people don't have a car(let alone a garage) and most people live in an apartment and don't have a yard.
But over the years there have been an increasing number of second hand stores in Taiwan. For a second hand store you only need a store front and some junk to sell.

At Jianguo Road and Badu Road there is a second hand store where I bought the cheapest Math book that I have ever bought.

The book is a xerox copy of an original textbook on graph theory of only 122 pages.(You can never know enough about graph theory.)  It is bound in a paper cover but the cover has no title, the spine has no title either.

Inside the book, it starts at the table of contents and then straight to chapter 1.
No publisher's page, no title page, no forward, no preface.

When I asked the clerks how much the book was, they weighed it on a scale. The weight was so little they had to reweight it on a smaller scale. Even then the weight was small so they just said it was 5NT, 5NT is about 15 cents. Good deal.

This book was one math student's solution to the high price of textbooks. Just get a copy from the library and copy the whole dam thing. It certainly is one way to beat the high price of college textbook where a phone book size book sells for $100+ and the professor proscribes the next edition after one year. And all the time the course only covers 10% of the book's contents.

Second had stores are a good idea that just keeps going and going. I even saw one in Japan for name brand designer/fashion items.

Used Select Shop Kind