Dice Update
I researched dice on the web and found that my best bets are with Chessex. They have a good variety, and they make the Borealis dice in six colors. The three D20s that I love, as well as 36 miniD6es are Borealis dice.
They cost about twice as much as plain transparent dice, and so these might represent a 'premium' version of the game. Perhaps it would be a status symbol, when merging sets to play a 4- or 6-player game, to have a Borealis-based set.
Chessex also makes the stones I've been using. They haven't responded yet to my volume-pricing inquiry, but I think I can assume prices to be equal or less than 65% of retail.
I've made a spreadsheet for pricing two-player Tao Dice sets using various levels of Chessex's dice.