No no, NONE of the Z-Crystals can be traded. I read they might appear to be traded, but this only happens if both the traders has the Z-Crystal already. (I'm guessing that, for example, if I traded you Kommo-o holding Dragonium-Z, it would probably still be "holding" it because anyone who's beaten the game has that crystal, but if I traded it to someone who just started the game it wouldn't be since there's no way they'd have it.)
I did hear about it! I'm excited to see what it'll be. It's still over a year away so that's a lot of time to think. I've heard the Switch is really cool but there's nothing I want to play on it right now. Well, the Switch is sold out everywhere so it makes sense that it's expensive. None of the stores in my city have it, except for the used stores which are selling them at a higher price since they're rare. @@ You mentioned everything is a LOT more expensive there though, so probably even the higher prices here are not as bad as they are for you.