For all you Mac Addicts in Saigon, worry no more, there are at least three Apple resellers in Saigon. My favorite, Future World, is located at 240 Nguyen Thi Minh Khai street in District 3. You will find probably the best customer service in Saigon at Future World typical of all Apple Stores around the world. The staff speaks English and accepts credit cards. Prices are a little higher than in the US but not by very much.
Address: 240 Nguyen Thi Minh Khai Street, District 3, Ho chi minh City (between CMT8 and Truong Dinh).