I got several off ebay couple years back
they seemed to be real 'used' ones from what I can tell
new ones are also available
shop around to see how prices run before buying
you can get -very- nice used ones
often for less than some sellers brand new ones
Some websites offer an individual tone sample from each bowl
honesty depends on site
there are hammered ones & lathed/spun ones
the spun finish is more predictable handling
but the hammered have more character [you knew that

]
from my limited experience
some of the hammered ones require a bit more learning
to get the speed & pressure right to avoid chatter
Several websites sell singing bowls.
Sorry, but no seller recommendations
but here's a good place to start:
http://images.google.com/images?&q=%7Esinging+bowls+tibet%7Cnepal%7Chimalayan%7Cindia
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