You'd buy a retired breeder just like you'd buy a kitten, directly from a good breeder
If there are any cat shows near where you live you could go to them and get to see the different breeds of cats and then talk to the breeders you meet there etc. If you can't make it to a show you can search out breeders near you. When they have breeding cats they want to retire they're usually advertised on the breeder's website.
As for bonding with you, as long as the cat is healthy, well adjusted and properly socialized they should bond well with you even though you've not raised them from kitten hood. Ex-breeding cats are usually very happy to be in a home with fewer cats where they can command much more of your time and bond with you rather than having to compete with all the other cats and kittens for attention.
I mean it's nice of course raising a cat from when they were a 3 month old kitten (You shouldn't get any cat younger than 12 weeks, the time until then is vital for their mental health and socialising and for the kitten to learn to control their claws and bites when playing with their siblings and mother.) but it can also be a very difficult phase to live through, they are spotted balls of energy and it can be hard for everyone involved and since a cat is a cat for most of their lives and a kitten for only a short bit, what sort of cat they are is more important than what they were like as a kitten.
If you go for an adult cat their personality is much more known than that of a kitten so it's easier to find a better match for you. Having said that kittens are of course a bit more of a blank slate so it might be easier to get them used to your quirks then but I don't think you should close off the option of getting a young adult cat.
There's a bengal breeder who's sometimes here on this site. Nial, he's a really good guy and you can see his website here: http://www.bengalshowcats.com/
I know he has adopted several of his ex-breeders to people he's known through the forum here and they're all really happy with their cats.
One thing to beware with Bengals is that the wild cat that was bred into them is a very shy and reserved animal and there are occasional bengal breeders who don't socialise their cats well enough. If they're properly socialised they're absolutely wonderful, outoging and very social cats but I know of atleast one person who got kittens who were not properly socialised and it was a big heart break for everyone involved.
This is not really a problem with the breed, it's just something you need to be aware of and be certain to only deal with a good breeder. This goes both for kittens and adult cats.