Basic curry powder can include (but not limited to) a base of: cardamom, chilies, cinnamon, cloves, coriander, cumin, fennel, fenugreek, mace, nutmeg, all kinds of peppers, saffron, tamarind, and turmeric.

This is definitely an item to buy.

Madras-style curry is merely a term for a hotter kind of curry powder.