Short answer
Special Wood is sold by Harold at the Stilt Houses for 1 silver each (10 for 10 silver, 50 for 50 silver, 100 for 1 gold). He only sells after his Organic Music request: deliver 2 Building Kit I and 1 Iron Kit II to his wood-catching machine. It is needed for the Church Organ (4), Wooden Kit II and five other recipes.

The Town harbour at dusk
View full-size image ↗Official promotional screenshot · © Lazy Bear Games / tinyBuild · Official media kit · Material credits
Reaching Harold
Harold lives at the Stilt Houses. Fextralife lists the route there: the Village election, Agatha's Notorious Nun request, Herbert's Still Standing on Stilts branch, and a win at the Battle at the Lake.
If you can see Harold but he offers nothing, you have not finished his request yet.
Organic Music: the unlock
Harold asks for materials for his wood-catching machine: 2 Building Kit I and 1 Iron Kit II.
Both kits come from the Factory's Assembly Bench line — our factory guide shows a starter layout.
After the hand-in, Special Wood appears in his dialogue.

Zombie workers in the official Town workshop screenshot, the kind of line that builds the kits Harold wants. Not Harold's machine.
View full-size image ↗Official promotional screenshot · © Lazy Bear Games / tinyBuild · Official media kit · Material credits
Prices
Harold sells through conversation in fixed lots: 1 for 1 silver, 10 for 10 silver, 50 for 50 silver or 100 for 1 gold.
No trader buys it back, so buy what your next project needs.
What needs Special Wood
Church Organ: 4 Special Wood and 6 Steel Detail — the Church Music II upgrade after the Choir.
Wooden Kit II: 1 at Assembly Bench II. Carved Wood: 2. Pro Rod: 2. Prosthetic Hand: 1. Elegant Prosthetic Hand: 2. Comfortable Chair: 3.
Zombie woodcutters later on
One Steam answer reports that later quest progress unlocks zombie woodcutters who gather Special Wood in the western forest, where the keeper cannot go because of wolves.
Treat that as a late-game option; Harold is the documented early source.
Study it once
Studying Special Wood costs 30 Science and pays +50 red and +20 green tech points.
It stacks to 30 and fits the Builder's bag, Universal bag and Big universal bag.
Sources
- communitywikily.gg — Special Wood
- communityFextralife — Special Wood
- communitywikily.gg — Harold
- communitySteam discussions — Special Wood
Related pages
Official screenshot · © Lazy Bear Games / tinyBuildProgressionGraveyard Keeper 2 Choir
Official screenshot · © Lazy Bear Games / tinyBuildAutomationGraveyard Keeper 2 Factory Layout & Setup
Official screenshot · © Lazy Bear Games / tinyBuildEconomyGraveyard Keeper 2 Steel Ingots and the Steel Anvil
Official screenshot · © Lazy Bear Games / tinyBuildAutomationGraveyard Keeper 2 Abandoned Sawmill
Official screenshot · © Lazy Bear Games / tinyBuildProgressionGraveyard Keeper 2 Church Organ
Official screenshot · © Lazy Bear Games / tinyBuildCraftingGraveyard Keeper 2 Iron Kit I & II
Official screenshot · © Lazy Bear Games / tinyBuildThe TownGraveyard Keeper 2 Harold