Here are some resources that address your question.
"WHAT IS A SAVANNAH CAT?" presented by Foothill Felines Bengals & Savannahs.
"The Savannah cat is one of the newest breeds of cats currently being
developed by a select few breeders around the world. There are very few
Savannahs currently in existence, and the demand for them is quite high. The
Savannah is the result of crossing an African Serval cat to a domestic cat.
... The first documented breeding of an African Serval to a domestic cat was
accomplished in the mid 1980's by [Judee] Frank, a Bengal breeder and cat
fancier in Pennsylvania."
More can be found on the home page of the above website.
"SAVANNAH CATS: EVERYTHING You Want To Know"
Select Exotics gets several good mentions when it comes to breeders.
"We produce Savannah, Bengal, Safari and Habari kittens. We are constantly
striving to create extraordinary contrasting colors and patterns in order to
capture the most exotic appearances."
Savannah kittens are not inexpensive, and depending on "generation" and other
factors, can run $1,500 to $10,000.
"F1 (50% Serval) $7,500 - $10,000"
The breed has an official Savannah breed charter organization recognized by
the International Progressive Cat Breeders' Alliance (IPCBA).
"The International Savannah Breeders' Association (TISBA) is composed of a
group of dedicated breeders, owners and enthusiasts who are united in their
efforts to preserve, improve and promote the future of all generations of the
domestic Savannah cat."
If you need any clarification, please feel free to ask.
Google search on: "Savannah Cat"
Google search on: "Savannah Cat" "Select Exotics"
Looking Forward, denco-ga - Google Answers Researcher