http://www.bandainamcogames.co.jp/cs/list/idolmaster/festa/spec/shop.php
Can someone translate this page please? I really wanna know about all the exclusive preorder bonuses. XD Lalabitmarket preorder bonus seems interesting. 
From left to right, top to bottom.
Asobit City: Bromide
Animate: (Single) One bromide each game you buy (Set) Bromide album
Ami Ami: Clear file, Sacoche bag (don't ask me why they're called this)
Imagine: Library card (Magical Pack only)
Enterking: Postcards
Chara-Ani: Bromide set
Gamers: (Single) Bromide (Set) Tapestry
Game Ark, Takara-Jima, Papyrus: Telephone Card
COMG: A bromide omg
Seagull: QUO card (denomination unspecified)
Theta Shop: Telephone card
7Net Shopping: PC wallpaper
Sofmap: Telephone card
Toranoana: Bromide
Trader: Bromide
Neowing: Microfiber Mini-cloth when will these end
Happinet Online: PSP wallpaper
Fammys, Otakara-Souko: Telephone card
Family Book: A4 size clear file
Medialand: Bromide almost there
Lalabit Market: (All three) Storage box for all three
Lawson: (Single) Original printed Shikishi (Set) Original Live Pamphlet
WonderGOO: Miki Tapestry, Miki Rice ball case, Yukiho and Chihaya Mug and I'm done
Notes
Sacoche bag - I could explain it, or you could
go to Ami Ami's site and look at the bag. That's a sacoche bag.
Imagine's Magical Pack - For certain items, can be ordered from Imagine in (what they call) a Magical Pack. As far as I can tell, it's Imagine's way of saying, "Get me a library card with this preorder."
QUO card - These are magnetic cards you can use at convienence stores, gas stations, etc. They seem kinda like a bus card or something. 'Cept of course, you can't use them here.