Reykjavik Sigur Rós December Shows

Hello! I was hoping to find ticket(s) for the Sigur Rós shows in Reykjavik at the beginning of December but when trying to search tickets, it comes up sold out. Is there a secondary/resale site that is widely used? I would be travelling from Canada and not familiar with buying concert tickets in Iceland. This would be a huge bucket list event for me and any help is greatly appreciated!