Black and white reversal is indeed still available from several suppliers.
But as far as Super8 goes, I think we lost the colour reversal option as soon as Kodak runs out of stock.

For Single8, there's still an option, and that is some good news. Fuji Velvia, T64 and my favourite, Astia 100F, have been unavailable in Single8 for some time now (at least from my usual supplier, and as far as I could search the internet, everywhere). As of now, my supplier has them in stock again, see .

So, not all is lost, if you happen to have a Single8 camera.