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1. Look for a supplier of firecrackers/fireworks before October. (internet or real life)
2. Get stocks of that shits.
3. Resell firecrackers/fireworks to your muchachos between October and the last days of December.
The idea is, buy cheap and high stocks of firecrackers/fireworks before the christmas and new year comes when the request is low and offer is high.
When the season comes, the request will be high and offer will be low, so you will can resell higher price.
THE NEW YEAR must be done with firecrackers/fireworks!