Yes, some less ethical breeders will say that it is the buyer's responsibility to ensure it is legal, but that is a cop out. They know that most pet buyers have no idea that the kitten might not be legal, therefore it is their responsibility to let them know and to do the research themselves to be sure the cat would be safe. We as breeders have responsibility to the kittens we bring into this world.
And I know that many think "nobody would find out" but that simply is not always true. A neighbor has a grudge and reports you, a friend has a falling out, or a coworker has a grudge. I actually know of a case where a person had two Savannahs (one was F1 and one F2) in NY state when the law was passed making them illegal. Her cubicle at work was plastered with pics and she was proud of her cats so all her coworkers knew. A coworker was fired and was very disgruntled, next thing there was the authorities banging on her door saying they had a report of illegal cats. Fortunately she was one of the very very few that actually applied for the grandfather permits for her cats so she showed them and had a lovely visit showing off her gorgeous cats. I've known cases where Fedex guy is scared by the cat that appears at the window and calls Animal Control. Repairmen that are startled by the "wild" looking cat... things you don't expect end up with your illegal cat being noticed.
And it is the cat that suffers. The cat loses its home suddenly at the very least. In some states and counties it can even lose its life.
It's easy to pretend that you found a website that says they are ok, or you asked your AC officer and they didn't know of any ban. If you are sure it is legal where you are, get it in writing or keep the reference to the part of the law that excludes Savannahs from any ban. It won't always save you if the next person in charge interprets the law differently, but it likely will buy you time to be able to rehome your cat safely or move yourself if you love your cat enough to leave.