Where can I get this stuff?

I live in temecula california, zip code: 92591, and I, being the crazy teenager I am, I wanna buy some cool stuff. First on my list is dry ice. Now, I know where and how to get it, but Im looking to buy it in bulk, not by the slab. Online would be perfect. The second thing on my list, thermite, is pretty easy to get ingredients, iron oxide and aluminum. The third on my list is liquid nitrogen. I need to find a dewer rental and liquid nitrogen retail place. My fourth thing on my list, is sulfur hexaflouride, or SF6, helium, and oxygen. In case you didn't know, sulfur hexiflouride is the same as helium as it is safe to breathe and it is not flammable, but opposite of helium as it makes your voice super deep, as opposed to high. If you are wondering why I need oxygen, its so we can breathe 100% O2 for a few breaths as to be able to take full breaths without passing out. The fith item on my list, potassium nitrate, is quite difficult to find and buy, dont ask why we want it. The final item on my list is pure metallic sodium, and not just a sliver, I want a moderate portion. I would like to know where I can get this stuff, how much I can get, and if you have any suggestions on other cool stuff to get.
Answer:

Are you a terrorist?

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