2d6 Result Defined Trade Good Unit Increment Base Price GP
2 Stomach Irritant* 1d6 x 6 10
3–5 Emetic* 1d6 x 5 25
6–8 Drow Poison 1d6 x 5 75
9–11 Arsenic 2 120
12 Giant Wasp Poison 1 200

*These have no statistical effects, they just tend to take the person poisoned out of action for a few hours to a day if ingested.

More expensive poisons are rare to find for sale at all, and have to be negotiated on a dose by dose basis.