It looks like I need to figure out this Tao Bao site...
Sourcing from primary language sites is, in my opinion, worth any pain you might have to go through... Plenty of great vendors with Chinese only/Japanese only sites or stores on things like tao bao and rakuten (Japanese site).
I went out recently to my local H-Mart and picked up a Zojirushi 1 liter thermos along with a small "tea bottle" they had for $3.00 for my first day of work today. The tea bottle has a built in filter that isn't that fine but it works well with hot water because the leaves sink more, while quick cold brewing things like Japanese greens is mostly out of the question, as they come up frequently through the filter. It is doable, but it requires too much care/time.
Anyway, I made a liter of boiling water and poured it into my thermos and off to school I went. 6 hours later I went to work and still piping hot! Poured it into my tea bottle (which holds 13.5 oz/400 ML) along with 3 big teaspoons of some Dragon Tea House 40% oxidized tieguanyin and tada! This is a very convenient and lovely set up and all in all it turned out rather perfect. I feel like the more floral notes that I can get from this tieguanyin don't come through as strong with this method, but all is well. Flavor lasted through the liter and surely could continue to go on and on. Next time, I think I may try some Sea Dyke tieguanyin. I might try it at home first along with some Vietnamese Green and see how that goes. I'm not wishing I had some cheap Vietnamese high mountain oolong on hand for this. Perhaps I can get some, as I know they sell some in Chinatown, but not from brand I would prefer. Oh well, life goes on.