Anyone looking for an exotic cat can really do nothing wrong looking up one of many reputable Bengal cat breeders.
This breed is known for being affectionate, exciting and extremely well behaved.
Back in the mid-1960's the first Bengal was bred, in an effort to preserve the beauty of the terribly endangered Asian Leopard Cat, while giving it domesticated qualities to make for wonderful-looking pets.
The domesticated varieties that are cross-bred with the Bengal are: Abyssinians, Burmese, Egyptian Maus, American Shorthairs and sometimes Siamese.
The reason you need to use reputable Bengal cat breeders is due to the fact that they're a new breed and also relatively expensive when compared to multiple-breed felines.
The first three generations (F1, F2, F3) of any cross bred feline can result in an animal that may not yet be suitable for domestic life and are still considered "wild" by The International Cat Association (TICA).
Also, the males of this generation are either born sterile, or quickly become sterile, meaning your cat might not be suitable for breeding (which is effortless for the cat, yet can be quite lucrative for you).
Good Bengal cat breeders will be able to show the registration for the cat and it's parents, grandparents, great-grandparents, etc -- to make sure your cat is indeed a Bengal and not still considered wild.
People that want to research, or shop around are best to look at online forums, or websites geared toward Bengal cat breeders and owners, to find out who has a great reputation for producing show-quality, purebred Bengals.
Expect to pay a decent amount ($500-2000) and don't try to go cheap on this purchase, unless you find a trusted source.
With purebred animals of all kinds: You get what you pay for and breeders selling quality know what the going rate is.