Okay, 3rd times a charm.
This item is only available to you if you're from San'doria from the Royal Armory for about 2.4k.
I'm Rank 10 Bastok currently and was not offered the item.
I logged in on my mule (rank 1 sandy) and was able to purchase it then.
Not sure if it's only available when sandy is in first and you're from sandy. I'll check again when San'doria is not first in conquest.
Edited, Fri Apr 22 02:29:13 2005