Right I didn't realize there were no cheap adapters, they all seem to have the helical that you'd need for the 50mm lenses.
Regarding cases I don't see how that's specific to this lens, it'll fit in any little case or pouch it'll fit in, vendors usually give dimensions for these things. Ebay is full of soft pouches, hard cases indeed seem to be rare. If you want to improvise, some metal canisters that fancier brand spices come in might be the right size?