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Restaurant supply stores, online, etc. They're called "BiBs" or "Bags in Boxes". Usually $80-100 each. Obviously meant for restaurant use, I don't recommend buying it yourself you couldn't make that much soda before it goes bad. But one of those bad boys will make ~120 liters of soda.

SodaStream has begun selling Pepsi syrups for home use. If they weren't an Israeli company I'd buy them.

I actually don't know maybe look in a wholesalers if you have one of those near you that lets you shop without having a business reason you can also buy it in regular shops sometimes but then you'll only find brands like sodastream not actual coca cola and fanta and that though