The Cost of Stronger Poisons?

[Garnfellow]

Are there cost guidelines for making/buying stronger versions (i.e. higher DCs) of existing poisons?

Take drow sleep poison: DC 13 Fort save, unconsciousness/unconsciousness for 2d4 hours, 75 gp a dose.

What would the price be for a dosage of the same poison, but with a DC 17* save? A DC 21 save?

* DC 17 was the original save for drow poison in 3.0.

 

[Shadow64]

You could use this:
http://www.wizards.com/default.asp?x=d20modern/we/20021103a

Which has a small section on making poisons, and then match a d20 Modern purchase DC to a D&D gold piece value. Probably take some poisons the two have in common and match the prices and see what the "new" posion would be worth in gp.

Song and Silence has a quick list of poisons, the creation DC and cost per dose, that might help out too.

 

[TheYeti1775]

Complete Adventurer has a section on it as well.