I've found it for the cheapest where I live for 2/5 dollars on sale. When it's on sale like that I usually end up stocking up majorly for my boyfriend since he LOVES it so much. Plus I rather he be drinking this compared to soda.
I've only seen it for around $3-4. It was worth the money when it came in a glass cup because I still have a bunch of those from years ago and I use them all the time, but $4 for some juice is a rip off.