Several of the DVC sales cast members had pins to trade, but I did not notice anyone else with them. The gift shop has an entire wall of pins for sale, so I would guess that those CMs might, also.
I am here now. There is a Mickey shaped pin board behind the cash register that has pins on it. I haven’t asked because I don’t have any pins to trade but I have been under the impression that that is the board’s purpose.
Trading at both Kalepas store and the one with clothing and handbags for sale. DVC sales center has a pin board and the concierge has a pin book. Most DVC personnel have pins for trading and some other cast members have also. I have found some nice pins here. I like pin trading at Aulani more than WDW.
DVC members can purchase DVC Aulani pins at Kalepas- but they are not on display, you have to ask a cast member for them. They are in a drawer behind the cash registers.
I think they offered it once a week each time we have visited. I would just check the iwa, it should be included if they are doing it. It wasn't a big event, just a few other people interested in pins and the book at the Pau Hana room. We'll be there in 3 weeks with pins to trade!