The latest PC thread I could find didn't load for me, the others were pretty outdated.

How much sP do I need to offer to find a seller nowadays?

You bought one... what a few months ago, perhaps you can be of help here.

They occasionally pop up and you can buy them for 150 or so. I expect if you buy them from a battler, you'd pay at least twice that

That's good to know, thank you! 😊