Suggs and Hardin camel back sofa, Chippendale legs, would like to know value

Check eBay or craiglist for an idea, but second hand furniture is low value.

Used? The answer is the same everywhere: what the market will bear. The market will depend on where you live, what the sofa looks like (upholstery type and color), and what condition it's in. Put a picture on craigslist for free, or ads around town, or your local paper. Even $3000 sofas rarely get more than about $300-400 used, because arranging transport is a big inconvenience.