Cels prices from TV vs OVA differ from series to 
series.  For some, OVA are more valued, and for 
others TV are more valued.  In FY's case, the TV 
cels are much more sought after because the 
artistic change in the OVAs was less than 
desirable by most fans.  The TV series is also 
where we first see the characters, so people are 
more attatched to the designs and scenes from the 
series.  

Cels of TV Tamahome with his long hair are VERY 
hard to find.  I've been looking for 2 years now, 
and no luck...  I've got a lot of Nuriko cels, 
and he's technically supposed to be harder to 
find than Tamahome...if that gives you any idea 
^^;;  Someday I'll find one...someday...