SOrry didn't catch this post earlier. Haven't checked this page in a long time lah.
Anyways, most fish shops in KL/Klang valley carry test kits I believe. Azoo and Sera are the most commonly available. My friendly lfs in Paramount Gardens (Irene Aquarium, PJ) holds a range of test kits for almost everything u'd ever test for. However, u should only need Ammonia (NH4), Nitrite (NO2) and PH test kit to start with. Each test kit cost between RM15-25.