I love Kombucha tea, and before I learned how to make it, I bought it at Tutti Frutti - best price in Toronto. It's about one-third cheaper than other stores. It's just unfortunate that the location isn't the most convenient for me but I love going there...always excited to see new things.
If you're like me and love Kombucha, the cost adds up. You should consider brewing your own. It takes a bit of patience to start your first brew, but overall, it's fairly easy. You should check out my post on step-by-step instructions on http://foodstochew.com/how-to-make-kombucha-scoby/.