
kadance |
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The material component for the spell is magical reagents worth the cost difference between a normal item and the equivalent masterwork item (typically 300 gp for a weapon, 150 gp for armor, or 50 gp for a tool). If an object has multiple masterwork options (such as a double weapon, or a spiked shield that could be made masterwork as a weapon or armor), you choose one option of the object to affect (though you can cast the spell again to affect another option).
That 50gp for a tool is consistent with almost every masterwork non-weapon/armor item in print.
To determine the price of a darkwood item, use the original weight but add 10 gp per pound to the price of a masterwork version of that item.
So regular item price + 50 gp (masterwork) + 10 gp/pound (pre-darkwood weight decrease) = final price.
And thank you for not asking for a dev ruling on this as seems to be unfortunately in fashion at this time.

Ravingdork |

If you want fancy furnishings for a whole room, it will cost 300gp to purchase, or half of that to gather the goods and labor to assemble yourself, per the rules for Downtime room building in Ultimate Campaign.
That could easily include things like magnificently carved darkwood furniture with exotic silk cushions and the like.

Emo Duck |

An easier, but more expensive solution than Mage Handing yourself around could be a Soaring Cathedra.
I got one for my bloatmage.