you're looking at $1200 - $2000 depending on the breeder and the breeding pair. Some breeders have a flat rate no matter the breeding. Some will vary the price between litters.
Far as color goes, if there are specific temperament traits you want, focus less on color. Yes, most WL dogs are sable. There are plenty still who are black and tan.
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Shasta GSD 5/5/10 CGC, ITD, TC
"Dax" Thor z vom Weberhaus CAX, CGC, ETD, HCT, RATI, RATN, TC 3/18/2013
Zena GSD 6/1/03
Riley GSD/BC 1/10/05-2/1/2013