Hi there. I'm the author of The Price of High Mountain Taiwanese Tea article. Thanks for sharing and commenting on it here. I just released some additional sheets from my Master Spreadsheet. These detail generalist vendors (Teavivre, Hou de Asian, Rishi, Red Blossom, etc.) and some of the more popular ebay vendors. The four tables (one for each tea) can be found at the very bottom of the post.
Also, I've never personally ordered from Naive Tea, but from my preliminary research they did seem to have at least a reasonable reputation (although the omission of harvest information is curious).