If you're still looking for a DVI to VGA adapter, I had the same issue a while back and found it easier to just order online rather than hunt around locally. I ended up getting mine from SF Cable — they have a good selection of both passive and active DVI to VGA adapters, and the pricing was pretty decent. Shipping to Thailand might take a bit longer, but if you're not in a rush, it's a reliable option.
Just make sure to check whether your DVI port is DVI-I or DVI-D before ordering, since that affects whether you need a passive adapter or an active converter.
