I don't personally collect from these series...but 
I have someone that I'm trying to trade with that 
does collect from Shamanic Princess...

Of the cels of Tiara I've seen...they fall in the 
range of 150-250. 150 would be cheap.  But then, 
there are other things to keep in mind since I 
think she has different looks.  Keep in mind that a 
dealer can put a price on a cel and if it is 
someone's dream cel...well...just about any price 
may be ok ^^...it's kind of difficult for someone 
to put a price on a character.  Could you be more 
specific?  Like a scene?