I have (2) brand new Thetford Porta Potti 335s for sale. - $60 each (firm). These sell for $120ish online and are available for local pick off Isle of Pines in Moneta (via land or lake). Again, these are unused and include the mounting hardware. They both came with boats that I purchased this year.
These are a must if you fish with your wife, daughter, or granddaughter :-)