Thanks for the suggestion of building an insulated box. Unfortunately I am not much of a DIY guy, and my busy schedule wouldn't permit me to build one anyway...
The best (easiest) option I have is probably this electric cooling box:
http://www.ibrew.com.sg/chiller.asp
It's made by a company in Singapore, the same company that is my (geographically) closest source for all other brewing equipment / ingredients. It's not the handsomest looking contraption, but I think it would do the trick (as long as I don't ever need to go cooler than 70F). It's quite expensive for such a simple setup though (about US$194), and I'm sure I'll have to pay an additional 50% or so in import taxes when it arrives in Thailand, plus a lot for international shipping.
Staying more on topic, anyone have some suggestions for a good fruit to add to my mead? I've noticed a recent thread about mango mead, and there is certainly no shortage of mangos here. There are also lots of other tropical fruits here that I have easy access to (passion fruit, dragon fruit, etc.)