I feel sort of like Ebenezer Scrooge since most people give theirs away at Lumi, but I was just curious if you could say trade them for Sp or an item from your WL?

yes, you can trade or sell them. some people even swap buddy GAs with each other (this is useful when you can't subscribe for a bit but have a bunch of buddy GAs saved up from when you were subscribed).

thanks so much!!