Sawadee Khun Benson,
The Jambul you can find mostly at the Jatujak market ( http://www.jatujakguide.com/home/ or http://www.jjmarketplace.com/jjshopping/index-1.php ). Mainly it's birds that capture from the wild. Many birds in one cage. It will not sing that good and have to keep for some time to be tame and display the good song. If you want to see good bird in display well have to go and see from the bird competition (normally we have almost every weekend around Bangkok). For this one have to check and have to have some person in Thailand take you there.
When will you come to Thailand (BKK)?
Regards,
Unnop

