Just quote him a reasonable price. He has no clue of its worth but whatever you feel comfortable giving him. I purchased a lot of stuff from a widow of my church. Got a sewing machine, a serger, a u shaped desk, a chair with lift up seat, lots of notions, sewing cabinet with contents, fabrics, & I won't have to buy thread for a very, very long time (on the big spools), rulers & templates. Later sold the desk (didn't fit, not enough room at edge of sewing machine) & the serger (which I have never used).