Working Lines do come in black and tan, but their tan won't be the deep red that Show lines have, and WL black and tans are usually more of a blanket-back rather than the classic saddle pattern.
I know when I first found out about sable GSDs, I thought they looked weird - just wasn't used to it. Then the colour grew on me and I prefer the sables over other colours. You may just need a bit of time to get used to the idea of a sable.
As for your question - puppies from responsible breeders from titled parents will run around 1200 - 2000 in working lines.