Another potions expert?

[Ersatz Harry]

No: HPFGUIDX 58968

Just out of curiosity, who do you suppose is keeping Lupin supplied
with his werewolf prevention potion these days?  Snape doesn't seem
like he'd be that willing to do do without a specific request from
Dumbledore, and we hear from Lupin that the potion is a difficult one
to make.  Does that mean that some other potions expert will emerge
somewhere outside Hogwarts?

Ersatz Harry