So easy to make your own and most fuses and such can be ordered off the internet along with a trip to your local gun store for your powder for reloading endeavors. Those spent CO2 cartridges for you airsoft guns come in real handy too. Make sure you get the right fuses though. They got some fast stuff that burns about 1 second per foot, don’t want to use that stuff. Just in case your looking for next year. https://cannonfuse.com/
many years ago when i worked in a hospital emergency room, a 17-20 yr old young man was brought by ambulance..
we uncovered his hand.. blew off the skin and muscle trying to make a homemade firecracker. the upshot was hsi father was my college chemestry instructor...
so no i dont mess around with any of that stuff