Ah well, as the Disaster set is now out of print, I suppose I'll have to resort to paying twice the RRP for a copy on ebay or Discogs.
You mean 'out of stock', like it says on the site, right?
Well, you can't really tell sometimes with La La Land's site. Some titles such as one of the Matrix scores have been listed as 'temporarily out of stock' when in fact they were out of print. La La Land produce some of the best soundtracks around, but the accuracy of their stock status of some titles could be improved upon.
In any case, MV said (in the post right after yours) that the Disaster set and Superman will both be back in stock later this year. Thank you, MV. I'm pleased to hear that. It'll give me time to save up for the Disaster set.