Depends on whether you need un-branded Taiyo Yuden or if Taiyo Yuden produced media under somebody elses brand is OK.
If you buy Fujifilm DVD+R 8x media (Made in Japan) then you get Taiyo Yuden (YUDEN000 T02). Many shops sell these:
www.mediecentralen.dk (Sweden - Danish language)
www.wesellcd.com (Germany - English/German language)
www.it-netsupply.dk (Germany - Danish/German language)
Verbatim DataLifePlus "Pastel" DVD+R 8x (but only the "Pastel" version) are also Taiyo Yuden (YUDEN000 T02). You can get these here:
www.mediecentralen.dk (Sweden - Danish language)
Genuine unbranded Taiyo Yuden can be bought here (I haven't shopped here personally):
www.os-mediatrade.de (Germany: English/German language)