Nightstar,
Letraset is also here locally. Near to Bugis area. As they supply to the museums and libraries locally, their stuff are normally acid free.
Letraset Singapore Pte Ltd
4 Jalan Klapa
Singapore 199316
Tel: 6391-1101
Btw, I bought my acid free neg sleeves via mail order from overseas. The good thing was that it was much cheaper than the normal ones sold locally.