I was looking in old threads in the AHS news section, there's a lot of cool info in there actually! ^_^
This thread:
http://www.ahsforum.com/forum/showthread.php?t=2825 has some info about RAINBOW first press bonuses - looks like there was a metal tray and a raincoat available with early preorders (Nov 15~Dec 10, 2002)...
There was also some kind of Lucky Draw for RAINBOW:
http://www.ahsforum.com/forum/showthread.php?t=2968
Prizes: A - RAINBOW - TOWEL SET
Y - RAINBOW - STATIONARY SET
U - RAINBOW - Keychain Set
H - RAINBOW - ORIGINAL POSTER
YesAsia offered a deal where you could buy the album and poster together.
It sounds like we're a little spoiled these days with all the free YA shipping and free prizes for simply buying a CD :eyeroll