Yes, the 'trick; is finding a cylinder close enough in size to the one that is currently in your gun NOW, just need the overall length of YOUR cylinder...............
are there any GOOD gunsmiths in your area?? ask them
I'm surprised that Ruger would say that as we know quite a few folks who shipped in their "new models" and got the 'spare' 9mm cylinder fitted, after all that is the way to go , but yes, it will be costly, shipping parts ,labor and all'...last one we heard cost the guy arond $168 TOTAL , there and back.