As well as tickets to/from "Skye (Armadale)" mentioned upthread, is the "Scottish Grand Tour" ticket product still available?
(Might have been temporarily withdrawn during the height of COVID-19).
Four days’ travel over eight consecutive days on the West Highland Line, Kyle Line, and Highland Main Line for £89.
The ferry connection between Mallaig and Armadale, and the coach connection to Kyle of Lochalsh are meant to be included in the price of the ticket. The pass also included travel on Edinburgh Trams and Glasgow Subway.