me and my friend are making a very large blimp and were wondering what we should do for gas

going to a store to get it filled up is out of the question simply because it will be much too large. not only that we still need to do things like balance it and test its flight out and everything. we’re using garbage bags as the membrane and trying to keep it as simple as possible to avoid small leaks but they cant be stopped without adding a lot of tape.

so i was wondering a few things

helium or hydrogen

hydrogen would be a lot cheaper and would end up having a lot more lift which we need all the lift we can get because we live at 6500 ft
but its also explosive, and hard to find. i have no idea where i would find hydrogen and whether or not most companies would even sell to an individual.

helium is very stable but has the worse part of the items mentioned before cost and lift.
although it is way easier to get helium apparently you can go to almost any party store and just pick a tank up for like $20

would another gas be suitable?

any help would be greatly appreciated
in fact if you do contribute significant help we would be willing to put a "sponsored by" on the side of the blimp
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