Mede is located near the center of Nivalis. She sells healing items made out from cactus. She has a bit profit to sell her items in Nivalis because the cactus she uses comes from all the way down to Tulimshar.

Items sold by Mede:

• Cactus Drink (50 GP)
• Cactus Potion (70 GP)

You can find the script here.