Do you have an architectural salvage dealer in your area? If so, I would think that you could place it with them on consignment or sell it to them. There's are a very large market in our area for period architectural antiques.

As a side note, I'd hate to get rid of it. (Even if I had use it in a barn.) I've saved and hauled (4 moves) a very long, large, heavy farm sink for years and one day...I'm sure I'll use it somewhere. (At least that's what I keep telling DH. LOL)

Can you turn it into the sink for a potting table? Install it outside to use when washing veggies from the garden?

The market for vintage sinks varies, but reselling it should be as easy as putting an ad in the pennysaver. Make it a "you pick up" because they are HEAVY!

How about using it as a focal piece in your garden, like as a bird bath? I am hoping to do that with an old sink I retrieved from the trash when a friend was rehabing her 1900's victorian seashore cottage.