You could try Sawadee Solutions translation service in Bangkok.....www.sawadeesolutions.com
Website is very informative with a fast turn around and reasonably priced
I have used them for a Certified translation and they send e mail version and EMS delivery with a stamped version and provide an excellent service, start to finish.
You can choose from Standard / Certified & Legalized translation by Thai M. of F.A.
1.2 baht / word and 10 % discount on first order
All prices are on the website and no hidden charges.