Didn't I upgrade heavy round in Ismirala castle, can't remember.
Here's the list for Reyvadin:
Destrier +2
War horse +3
Steel bolt +1
Padded cloth +1
Heavy aketon +1 (Don't know the fuck that upgraded 2 different light armor)
Rus scale armor +3
Phyrgian helmet with faceplate +3
Plate mittens +3
Rondel dagger +1
Scottish sword +3
Steel pick +2
Warhammer +3
Mallet +2
Morningstar +3
Longsword +2
Great axe +1
Great sword +3
Lance +3
Long spear +3
Long axe +3
Awlpike +3
Brown lion heater shield +3 (WHY, OH GOD WHY! I hate that stupid shield, oh btw if we don't have the huscarls anywhere else, I'll upgrade it next instead of that piece of shit...
)
Jarid +3
Arbalest +3
Mostly all around 20-30% discount + bunch of other random +0 gear and all the engineer stuff you need.