http://www.ayumi.primenova.com/discography.htm
Discography, but not 100% up to date, the recent stuff isn't hard to find out, just check yesasia for the more recent additions.
It's only missing the 3 RMX CDs, Memorial Address, &, forgiveness, No way to say on that site I think.
And perhaps the DVD Audio CDs if you want to count those as well...