Cost for ironwood full plate?

[Legildur]

Ironwood might have the 'cool factor', but Dispel Magic suddenly becomes a whole lot more dangerous to you.....

 

[Kurotowa]

The ECS has bronzewood, which is pretty much what you're looking for. As tough as metal it can be used to make heavy armor and weapons, but with a couple of minor benefits like no Hide penalty in woodlands. The listed price for heavy armor of bronzewood is +9,000gp.

 

[Andras]

Bluewood, from Unapproachable East.

Volodni craftsmen...sculpted with woodshape....magically treated...same hardness and hps...half the weight of metal item...considered masterwork.

Heavy Armor +1,200gp.
Weapon +400gp (the spikes)

magic treatment takes 10 days of work by a Volodni with 10 ranks in Craft Alchemy or Woodworking, or a non-Volodni with the previous skill and Knowledge Local (Volodni):2

 

[javcs]

What about crafting it yourself via craft magic arms and armor? That would, depending on DM interpertation make it essentially permanent.

If psionics are allowed - matter manipulation permanently adjusts hardness by up to 5 points from the original hardness and adds 3 hp per point of hardness added. The downside is it takes 250 xp per point of hardness by which it has been altered.