Fahasa Bookstores are famous in Saigon among Expats and Vietnamese students alike. You can find reasonably priced English books here. We are talking about originals. I bought about 8 books for about 500,000 VND ($34 US) today.
(District 1 has 3 Fahasa Bookstore Locations)
Fahasa Bookstore Addresses in Ho Chi Minh City:
185 Dong Khoi Street, District 1, HCMC (International Bookstore), and
40 Nguyen Hue Street, District 1, HCMC (Pictured above)