Both of these are attractive options. The bags from YS are priced competitively - though the shipping fee is a factor to consider. Sorbent systems is like a gold mine for this kind of bag, and the mylar zip bag comes in all sorts of sizes; with OTTI alone, Chip must run through boxes of this bag.
I since called Upton Tea, and they offer a three-layer reclosable bag for around 20 cents each. There's also a local tea shop, Aroma Tea; they sell lots of tea, and certainly have bags they might be willing to sell.