Is it advised to buy the verbal and quant practice problem books from ETS's website or Amazon?

I’m from India, and I’m looking to purchase both the verbal and quant practice problem book (The one with the 150 real questions thing).

If I purchase the books from the ETS website, would I only get an e-book or would I get a physical copy plus the e-book?

Is it advised to get these books from Amazon? Do they sell the original version or a pirated version? Do you guys know any reputed sellers?