Check out http://www.himalayanbowls.com/index.htm
, for example. You’ll see there’s a pretty large range of bowls of different sizes, materials, and antiquities. I came across fine antique singing bowls, rare & unique singing bowls, special deep singing bowls, antique harmonic sets, hand made gold color, hand made bronze color, hand made bronze engraved, hand made copper engraved, machine made cup bowls, machine made decorative copper...
Take one page, e.g. http://www.himalayanbowls.com/products.htm?categoryId=5
, and you’ll see there are a variety of different sizes, and a corresponding range of prices. Compare with other pages where there are differently aged and priced specimens. I’d be spoilt for choice if I had to decide which to buy. I noticed there’s 20% off some of the stuff on this site.