It is not still made. Same as many other great films that have been discontinued the past 5-10 years. My pet peeves are the various tungsten-balanced films, pos. and neg., that are tragically now GONE, leaving us only with 64-speed tungsten transparency films from Kodak and Fuji. I miss 320T like nobody's business! It was my favorite film for abot 50% of my shooting at the time. 160T was nice. Portra 100T, Fuji NPL...rrrgh.
The good news is that there really wasn't anything *super* special about Scala anyhow. It was really nice, but you can get close to its look with films that are still available, if you put time into experimenting. It was just a regular black and white negative film, but one that was rather high in contrast, so that it could beautifully handle the loss of contrast that occurs when films are reversal processed. You can process any "true" black and white film as a transparency or as a neg. Even color transparencies are neg. films to start. It is the chemical process that flips them.
I would say to try FP4 or Plus-X as an alternative. Freestyle also advertises a certain film as a good replacement. I can't remember exactly what it was called...Foma 200, I think. Ilford's published reversal process has worked very well for me in the past. Photographer's Formulary also sells a kit, but it is very expensive compared to the Ilford method, and is labelled as being for T-Max films...whatever that means. I imagine it would at least do SOMETHING to other films as well. You can also ship the film to the DR5 lab, which is in Colorado, USA, if I remember properly.