A little late to reply but it came up in a google search for Wu Wei... we just bought some at the Sherman Market in Union Square, Somerville. They have a good assortment of MEM teas (which are blended here in Somerville).
The tea was created at Teahouse Kuan Yin in Seattle over 20 years ago and is now copied by many retail, and even, wholesale tea companies. We, of course, think ours is best! Our tea has been re-branded by us as Origins Tea, but the tea is still blended at our only store in Seattle.