She sells them infinitely once you reach drangleic castle. I'm not sure what the exact trigger is, but she sold them to me after I hit the first bonfire there.
And definitely either that guyVelstadt or the boss you haven't reached yetGuardian Dragon. The only problem I have with the latter is that issuesHe's designed as a normal enemy later on, so as a boss he has absolutely NO HP. It's sad really, as he is a total blast to fight and the arena he is in is just gorgeous
NG+ ProgressI'm at the mirror night now, been mostly doing some jolly co-operaation so progress has been a bit slow. I cheesed freja and lost sinner with summons because they're the two biggest obstacles keeping me from getting everything I need for this build. Freja on NG+2 1-shots me when she steps on me at max health. Considering the huge trek there I was not in the mood for that. Lost sinner in NG+ just scared the ever living crap out of me and I caved after only a few attempts ended by those godforsaken pyros. Oh well, got a ton of easy bosses coming up. Mirror knight ~> demon of song ~> and then hex hammer of screw you ~> giant lord and then finally throne watcher/defender and natasha. THEN I WILL HAVE MY INFINITE TITANITE CHUNKS AND HERBS!
Also, the Estoc is a really fun weapon. It reminds me a lot of the Balder Swag Sword from DkS1 and it makes me wonder why I never used the estoc in that game,