their really is a high-priced market for saiyuki 
reproducion cels and original sketches, imho. 
sketches (good ones, anyways) usually range from 
about $15 - anywhere near $60 - depending on 
their quality. it's not that rare nowadays to 
find saiyuki sketches in cel shops, either; i've 
gotten some good ones from anime chaos, 
animegame, and usagi's house. 

those three places also carry the reproduction 
cels, although i don't own any of them. there 
are some japanese sites that carry them 
sometimes, but they usually sell out pretty 
quick. i don't own any of the repro's because i 
find them to be a little pricey for being only 
repro's, and i'm a fancel artist so i could just 
make one myself if i wanted one. animechaos has 
his repro's priced at about $55 a piece, 
although he sold that sanzo one. usagi's house 
has repros that are pricier, but they also have 
some rarer ones and ones from the movie.

i hope the info helps; i don't have much of my 
saiyuki collection online, just a couple of the 
sketches and two fancels. here's a little sanzo 
that shura painted for me:



i was thinking about painting one for myself, 
but i have to find the right image first.

seaira