There's this little success story from summer 2011. Problem: our thai keyboard in the kitchen was a crappy, old, yellowed Logitech thingy. Didn't like it's clattering sound too.
Time to replace it with an excellent Digital Media Keyboard.
To add the Thai Kedmanee letters I ordered these stickers from 4keyboard hosted @amazon:
Delivery was fast, quality of the product great, its price very low.