Pirazzo's Lost Legion is one example of old Estalian units (Dogs of War).
It's no longer legal, in any official capacity, but hey
The dogs of war book is freely avaliable as a PDF I think, also ebay will probably have some old book for them too. That's the closest thing I can think of.
Oh yeah, Blackhearts books featured a character, who was either Tilean or Estalian, I believe he talks about his home on several occasions there.