My condolences to poor karma, I think I've posted before that some animals never get used to fireworks. A bit of a heads up allows owners to secure their animals ahead of the show. Perhaps SAGA could inquire about the possibility of requesting notice in the local paper or e-papers?
I can say based on my own shows that the estimate of about $5k USD for the minimum show is about right...in the states. I doubt it runs that much in Belize.
The shells are likely mexican, or at least central american made, which makes them much less expensive on the wholesale basis. Of course the local operators are just that, local and don't require much in the way of travel overages like some companies I have worked for (Grucci,Zambelli,Souza) The driving cost in the states is of course insurance.