No deals in SIN that I could determine. Too squeaky clean.
Software of all types, pirated of course, is available in BKK.
Selection is biggest in Akihabara (Tokyo), possibly in the entire world, but prices aren't so hot and warranties outside Japan can be a problem. Never thought much about what is available at Narita airport, if you can't get to Tokyo, maybe you could get to the Llaox store in Narita town.