Private to Professor Snape
I will work to see what I can supply here from mundane ingredients, and what will need to be sourced from another place.
What would you consider a reasonable percentage of the profits? I feel myself, as if it should be contingent upon my using potion ingredients in a potion, of course. Some potions for free would be fine, however some require a lot more intensity to them - so perhaps we should look at what types of potions you are interested in most frequently and arrange something with those?