I used to buy the pre-packaged ones you get at stores but after seeing how easy this is to make at home, i don't buy this anymore. All you need is a few minutes and a mixie that can powder stuff.
PARUPPU PODI (DHAL POWDER)
Pottu Kadalai / Dalia / Roasted Gram - 1 cup
Red Chillies - 12 to 15
Garlic - 3 cloves (optional)
Salt - 1 tsp
Copra (Dessicated shredded coconut) - 2 tbsp
Ghee - half tsp
1) Heat the ghee in a pan and add the garlic, red chillies & pottu kadalai (dalia). Toss till they warm up - don't let them brown.
2) Allow this to cool completely and transfer to a jar (I use the medium jar of my preethi mixie for grinding powders). Add salt & the copra (dessicated coconut) & powder till fine. Serve with rice & ghee. This keeps well when stored in an airtight container for use later.