Some additional experience of buying tea from real world
For me in my region, I still don't expect to get upscale tea (didn't even find those for high price, let it alone reasonable price). But in recent trips to Boston region Asian grocery, I did find some buy-able teas! I used to think there is no tea worth buying in Asian grocery

Then I found:
1. I bought some Shui Xian oolong (shui hsien) carried by a Hong Kong company. $2.99 for a can of 5.3 oz. It's actually pretty good. Since shui xian is a dark-roasted oolong, I don't care much when it was produced. The well-sealed tea can seems to make the tea inside last forever. In Cantonese meals (which dominates Hong Kong), dark-roasted oolong (and puerh) is used most often. As a daily tea, oolong is not as much romanticized in Cantonese region as in the rest of Asia. So I am not surprised about the low price and very happy about the quality. Next time, I think I am going to buy some lapsang souchong in similar tea can package. I don't think most customers in Asian store come for tea, and I don't know how long their teas have been sitting there on shelf. So I will still stay away from the typical short shelf-life tea such as green tea and green oolong
2. I am not a big fan of gun powder. But I bought some entirely out of curiosity and because it almost cost nothing. Gun powder is gun powder, doesn't get much worse or better. Gun powder from Asian store tastes to me exactly the same as gun powder from other more expensive sources. Even though in every store, gun powder is probably the least expensive tea, gun powder from Asian store is BY FAR cheapest in price!