Mahony, CWL,
If you can read Thai or have a friend or wife that can, go to
www.pantipmarket.comMany Thai photographers advertise their services there.
I don't know about weddings but graduation shots are B2,500 for shots with Canon 30D, 580EX flash, etc.
Another option is just to pop into a few photo studios to see what they do. Many will have wedding shots plastered all over their walls.