I love mysafebirdstore.com
they're the best. I have the SS bowls that came with the parrot's cages, and for Griffin's aluminum cage, I got them at a bird store. They're in bolt on rings since for parrots they have to be or they'll be on the ground, and I don't like them because they don't bolt on very well and get loose and slide around
. The budgies use the little plastic square 'bucket' cups
. I like those ones from Dr's. Foster&Smith in your link. I think they might be too heavy to worry about budgies throwing them off the cage?