I agree with Shirley and Angie. It was my first thought. I loved my grandmas treadle as a kid, hated it as a teen, and when i was in my 30's, wished I had it, found out my sis did, asked her for it, she sold it for $30 cuz she needed the money.
If you really cannot keep them around, sell on e-bay and price accordingly for S & H. Check the prices out on e-bay so you have an idea. Also, prepare one for shipping like you would like it to be packed if you had bought it, take to PO and have weighed/insurance (if you want), and set your price. Add a little for the shipping materials, it is only fair you do so. Don't be too hasty getting rid of them.