Why the price differential? If Amazon had cornered the market, they might charge that much. But it looks like they goofed. Wal-Mart sucks. They are vicious to their small suppliers and when China says ‘jump’ all they ask is ‘how high?’ But at least you can get a good deal on carbonated high-fructose corn syrup water in a celery flavor, and Amazon failed to screw a few Jooos! over.
Being diabetic, I have had to sworn off all high-fructose corn syrup drinks. But I have a Soda Stream machine, and only flavor my carbonated drinks with lemon juice, coconut milk, and/or leftover Shabbos wine.
It’s sold through not by Amazon, someone called New York Beverage through Amazon. Someone else called Libros Judios sell through Amazon, 3 six packs for $32.30. My guess you can find it other places. In restaurant quantities, might be a different story. Checked a few grocery chains and it was “unavailable”