Hi, I have been collecting trading cards of Idoling members for quite some times. I've been buying them from Ebay and directly from Japan during my vacations.
I noticed there isn't much info on the cards that each members have released and/or releasing.
I'll post some of the one I own/know of:
Endo Mai (Official Card Collection
Sakurado 2011 Other Self 04/2011 release)
Tonooka Erica 2 (Premium Collection Card
Box Corp., Official Card Collection
Sakurado Erica 2007)
Fonchi 2 (Official Card Collection 2009, Official Card Collection 2 Sony Music Artist TRY-X 2010)
Yokoyama Rurika (Official Card Collection 2009)
Morita Suzuka 2 (Official Card Collection
Colorful Sakurado 2010, Bomb Card Limited
04/2011 release)
Nagano Serina (Official Card Collection
Serina no Dai Boken 2010)
Sakai Hitomi (Official Card Collection)
Kikuchi Ami (Official Card Collection 2010)
Miyake Hitomi (Bomb Card Limited 2010)
Tachibana Yurika (Offical Card Collection avex management TRY-X 2010)
Okawa Ai 2(Hit's Limited, Official Card Collection
Sakurado AiDoll 2010)
Ito Yuuna (Official Card Collection
05/2011 release)
Please feel free to add to this list, cause im sure I'm missing some.