Recently myself and a few others started playing Descent and are looking to expand it at some point. However having looked around online I can't find anywhere that has the RtL expansion in stock. Does any reliable way exist to acquire RtL? If not, is there ever likely to be another batch made?

RtL does seem to have been hard to find for a while now. FFG hasn't any official announcement about it (or any other Descent product) going out of print, though. That I know of. I would expect the entire game to go OOP at once if at all, though. Unless an expansion REALLY tanked, and RtL does not seem to have done too badly for itself.

looked for it everywhere online but couldnt find a reliable source.

so I started calling rpg/boardgame retailers in nearby towns and then expanded search further and further until Igot a hold of RtL from a store.