You can try anime-taro, animanga(of course) ^_~ 
and yahoo japan. However, cels from MMT are very 
hard to find especially of Akane. I just 
recently got a full shot of Akane and she ain't 
cheap. =P Well good luck and hope you find some 
for your collection.

Regards,
Phillip

P.S. I'll just post my hanken I got from 
animanga of MTT. heh=P