Amazon advertises the purchase of gas together with the AirSwimmer. It remains to mention that the bottle at all is not enough, just half AirSwimmer filled. Now you have to know that German DIY (ie the big and small brands) sell no more helium. One can go to a maximum of a gas trading and try it there. I after the disappointment of "helium balloon gas Einwegflasche Bombolo" an Odyssey by shops behind me and then got eventually an American product in the right size / or, bought sufficient quantity for a lot of money on the Internet again. Amazon should no longer apply together with the Airswimmers this supplier!