Ebay and Mecari are your friends for classic wool shirts. I've scored a few new old stock woolrich shirts with tags, still in the bag off of both of them.
I have had good luck on ebay. I really like the old Sidney Nebraska Cabela's wool garments. Picked up an old cabalas flannel that is my go to as well as some nice pullovers I love wool and am always on the lookout for new XXL pieces. You have to be careful though with sizing on used wool pieces as ive gotten some very shrunken pieces lol.
I also have the LL Bean commando sweater and an Asbell q zip mentioned above and I find them to be a little on the heavy side.
I would love some more wool/merino flannels that aren't $100 +... im tyring to move away from polyester as much as I can in my wardrobe.