how many pebbles would you want per copper bar? I could also offer higher tier bars if you like? I have a ton of silver and some mithril and lorium and a bit of gold (I've been dropping chaosium unfortunately) - or sapphires/fluorescent gems, if those are of any interest?
I have about 30 lorium, I'd do a 1:5 for copper? As for pebbles, I think cooper bars cost 30 in the MM (correct me if I'm wrong) so I'd be happy to pay that!