Looks like there are several positions for each item to be obtained. I've definatly found some of the items on enemies or as loot in my first playthrough, now im seeing them on merchants. Might be, that all items can be looted and bought, might be different based on diffiulty level.
Pollaxes
Spectacular Spetum - Fine, Marking, Guarding - Can be bought at the Club of Prestigious and XX Gentleman [2nd Floor of the Salty Mast, need the Ring from the drunkard at the stairs lvl1, Ondra's Gift, Defiance Bay]
Great Swords
The Temaperacl - Can be bought at the Club of Prestigious an