I usually buy my Bubble Tea at Fuzion Sushi in Saskatoon, Saskatchewan, Canada (Saskatchewan is "above Montana" to anyone curious), and I sometimes buy it in Regina, Saskatchewan at Ngoc Van. The only other cities I've tried it in are Red Deer, Alberta and Calgary, Alberta.
I went to a shop in Chinatown in Calgary and the man working "guaranteed" that he made the best bubble tea I'd ever try...whereas he was right about the tapioca (it was perfect--not mushy, not hard, just right!), I wasn't too big a fan of the Red Bean Bubble Tea, which is odd because I like anything Red Bean. He was pretty cocky about his product, which is good, but...he did try telling my boyfriend and I that "most bubble tea shops try to fool white folks into thinking their bubble tea is the real stuff"--which was sort of funny, and sort of racist. But I love Bubble Tea and can deal with that sort of smack.
Taro is by far my favorite EVER. It was recommended to me once but didn't appeal, so the man working actually made it and gave it to me for free because he had decided that it would become my favorite flavor. Oddly enough...he was right. It's amazing. I've only had about a dozen kinds altogether (including cappuccino, red bean, pomegranate calpis, green tea, coconut, lychee, mango, pineapple, strawberry, etc etc), but I always end up buying Taro way more often than anything else. I'm hooked. I'm not a fan of a lot of the non-milky flavors, to be honest.
I recently ended up buying two bags of powder flavor--Taro and Mango--from an Asian Grocery store, as well as 4 little bags of Tapioca (2 black, 2 rainbow). Now, I've tried making the drink itself (WAY too strong if I followed the directions), but I haven't tried making the tapioca yet...the package says it only takes 5 minutes to make......but everywhere online has said it takes 25-50. What do I do!! I don't want to experiment too much, because I only get to a supplier about once a month if I'm lucky!
Anyway, sorry for rambling, I just love bubble tea and felt it necessary to express my love for it, hehe.
Edit: I just realized that "a supplier" made bubble tea sound like a drug. Haha. Oops. It's a "good" addiction, beats a bad addiction!