Budak Meja Belakang is available at MPH and Popular Bookstores. Alternatively, you can purchase the book straight from the publisher (Komrad Buku) through their site:
Kuantum is available at Kinokuniya (KLCC), Times Bookstore, MPH Bookstores, Badan Bookstore and Kedai Fixi. Alternatively, you can purchase the book directly from the Publisher (Dubook Press) via the following link:
Note that my first two books Catatan Pengembaraan Seorang Flowerman and Taki & Dira are not available in book stores. You are most welcome to purchase them from me directly.