I think you are thinking of craigs list.
I have a wilkins pvb repair for sale .Never used. Can we advertise stuff for sale on this forum. If so Iwill post price,picture and model number info.
IT might not be worth advertising. If someone needs it, they usually need it NOW, and the cost of it and mailing might be more than a new one. There is only one piece, the float, that usually needs replacing, unless the cap was also damaged.