Noting them here as I come across them:
- Gold leaf from the Lumber Yard - 110s for a small amount. The same amount produced with jeweling costs 110 for the bar of gold (the amount of small gold leaf seems to equal the cost for a bar of gold regardless of how prices fluctuate with plots, etc.). Merchants would have to undercut the NPC shop and go into the negatives to sell gold leaf to players.
Same applies to the large amount of gold leaf from the Lumber Yard. 220 from the NPC shop for large amount, 220 for a jeweler to buy 2 gold bars and produce it. You would have to undercut the NPC shop to sell it and end up making a negative profit.
Silver leaf is the same for small/large amount - the price of the silver bars is directly equal to the cost at the NPC shop for silver leaf.
Silver instrument fixtures are sold individually at The Lumber Yard for 22 silver per set. A silver ingot costs 110, and you can make 5 sets from one ingot with jeweling. 110/5 is 22 silver. Equal price from the NPC shop - Merchant would have to undercut/go into negatives to sell them to players.