You know, I forgot to factor in some things (like that it has no arms and no legs) so one could make the cost something like:
1000 gp per Warden Jack
(20 xp, 50 gp body cost)
I'm fudging the body cost, because in the overall scheme, it affects little except what an artificer is paid to make the body.
Also, the general trend is that a great deal of the cost of a construct is in the animation ritual. Components which would usually be dirt cheap to accumulate (dirt, for example, maybe wood) are balanced by the costs of the magical apparatus, disposable components, inks and resins, and other nonsense associated with the ritual itself.
- Devon