Are all Ayu's albums available in Japan?

[Hazuki]

Japanese albums in Japan are available like American albums in USA
No matter how old it is, you should be able to get it~!
Since Ayumi's albums aren't out of print,
your friend shouldn't have any problems finding them for you.
The only shops I know are Tsutaya and HMV.
Many smaller CD shops would have them, but all depends
on where your friend wants to shop~