It looks like the best way to sell the cels is 
straight from you to the collectors. Put scans 
online and ask for offers of the collectors or 
provide prices. 

I would be especially interested in cels from 
the series Wedding Peach, Silent Moebius, 
Gokinjo Monogatari, Maya the Bee, Little Viking 
and all Magical Girls series. Please feel free 
to contact me!