Years ago I built several racks that can hold lots of fireworks. I have three racks that can hold 24 Roman candles each, or large bottle rockets. I got some HDPE mortar tubes, about 70. I buy mortar shells and Cannon fuse and connect them all together in groups.
The most expensive shells are canister shells, 60 gram, about $6.25 per shot.
Years ago I built several racks that can hold lots of fireworks. I have three racks that can hold 24 Roman candles each, or large bottle rockets. I got some HDPE mortar tubes, about 70. I buy mortar shells and Cannon fuse and connect them all together in groups.
The most expensive shells are canister shells, 60 gram, about $6.25 per shot.
This is all consumer grade, of course.