Where to find these armor
Conjurer and Cabalist armor are level-dependent drops; you have a chance of getting Cabalist armor as a drop once you’re level 40 or so, and Conjurer armor once you’re level 55 or so. You’re more likely to see them in zones above those levels as all drops will be in the correct level range, while low-level zones have a chance of dropping gear at the zone’s level (and hence not a high enough level to be cabalist or conjurer)
Unlike weapons, there aren’t zone-specific armor skins. Which armor skins can drop is dependent on the level of the drop, that’s all.
So pretty much if you want cabalist go to a place thats like 40-50, and conjurer like 50-60
Can i just buy them from black lion trading company? or are they like soulbound or accountboud?
They’re item drops and generally appear at blue/green rarity, so they’re not accountbound or soulbound on acquire. You should be able to search them on the TP.