How much should I expect to pay for dry-cleaning silk scarves?

They’re not fabulously expensive designer scarves, but they are decent, and they are silk. They’re also kind of old.

I’ve read online how to clean them at home using water and a little of the right soap, and I’m not sure I want to risk it.

So will it cost a fortune to take, say, a dozen of them to a dry cleaner?

Further: what about chiffon, and what about synthetic fabrics?