Hiya! Nice to meet another avid Saiyuki fan! 
Well, the TV sereis just finished up in Japane at 
ep 50 (and a terrible cliffhanger, too, may I 
add). Being a loyal fan who's stuck through the 
series, I of course checked this matter out 
myself.

Saiyuki is, unfortunely, done on computer, so the 
most we could ever collect would be douga. 
However, reproduction cels were recently released 
at Enix's January Saiyuki event, but it's most 
likely that no one will be letting those go for a 
while since, yes, Gensoumaden Saiyuki is indeed 
the most popular anime in Japan right now. It's 
ludicrous the things they've made...and that I 
want them. I hope to be able to order the Sanzo 
vinyl hsirt and Goku headband not oo soon, but 
for right now I'll just cuddle my rather 
expensive Jippu/Hakuryuu plushie =^.^=