The bovd puts the value of a soul in a receptacle at 200 gp. 250gp if in larval form. IMHO, that's insultingly cheap for a soul, so IMHO that should be the cost for a level one character and probably a commoner to boot. Level squared times 200 gp sounds like a much better price on such a precious commodity.
That sounds like a good starting place, and a great bit of fluff to add to the creation of a warforged. However, I think that if a warforged were created with levels (and thus HD) It should follow the same rules for extra HD (after the first, of course) that is given for golems in the MM:
D20SRD.ORG said:
Note: The market price of an advanced golem (a golem with more Hit Dice than the typical golem described in each entry) is increased by 5,000 gp for each additional Hit Die, and increased by an additional 50,000 gp if the golem’s size increases. The XP cost for creating an advanced golem is equal to 1/25 the advanced golem’s market price minus the cost of the special materials required.
And I think it should follow a similar rule as the Artificer's homunculus in that it can't exceed a fraction of the original creator's HD (when created, anyway).
However, this still leaves me at a loss for base cost for materials. The Flesh Golem, the one that costs the least to make in the MM, costs 10,500 gp to create in materials and components. It has 9 HD, is of large size and has a few extra nifty abilities. However, taking into account that it requires a lot of material, but that the material is cheap, it doesn't give me a great estimate as to what the cost would be.
So, going up to the Iron Golem would be my next best bet. However, this thing is of large size and has 18 HD, not to mention its breath weapon and other special qualities. It costs 80,000 gp to create.
So how do I price it? The materials that go into creating a Warforged, as the MMIII tells me are obsidian, iron, stone, darkwood and silver. These are obviously more expensive than 6 bodies and special materials, but at the same time, 300 lbs of these materials should cost far less than 5,000 lbs of iron and the 10,000 gp cost of smelting materials. If the Iron golem was made with the HD rule previously stated, bringing the cost down to 1 HD (ignoring the cost for increasing size) and not including the extra materials costs brings the cost for base materials for a 1 HD large Iron Golem to about 34,000 gp.
Considering that this golem would still weigh at least a ton and the materials other than iron for crafting a warforged, with the possible exception of stone, all cost more at equivelant weights (or so I assume), I think that a reduced cost would be a decent guestimate as to the sheer materials costs for a medium warforged at first level. Say, 20,000 gp? Not to mention other special materials that might go into the creation of a warforged (what they are, or could be, I have no idea).
So, does 34,000 gp (base materials and other special materials) seem like a fair price to pay for the creation of a warforged? Is it too low, too high?
I know that I'm pretty much answering my question with this but I'd like some feedback as to what people think is a fair guestimation as to the cost of creating a warforged.