Hello, you could try Ecowitt as they are linked to Fine Offset and so can source anything FO still manufacture
http://www.ecowitt.com/weather_station/e-mail: support@ecowitt.com
Try browsing the website and/or contacting their support department with the question.
Their website does not show everything that FO sells so don't take it as gospel that if you cant see it they don't do it anymore without asking them.
They are very responsive via e-mail and usually (Lucy) will respond within a day or two.