I assume that you are from the US as you use bestbuy.com
Many CD Freaks users prefer ordering their Taiyo Yuden discs from Rima.com.
EDIT: Arachne beat me by a minute.
If you want the most genuine discs, the best choice would be getting That's brand discs (That's is Taiyo Yuden's own brand), which can only bought in Greece, Japan, Korea and Hong Kong.
If you want to buy Taiyo Yuden media in Europe, keep in mind that That's media is not widely available outside of Greece, and many Greek online shops do not ship even to other European countries.