Not sure if this is threadworthy, but I decided to make one anyway.
A few of Ayu's (and other popular artists) singles are marked down to really good prices. Like 500 yen for Sunrise/Sunset CD only.
Here's a link to the singles - I didn't see any of her albums marked down.
http://www.cdjapan.co.jp/offers/sale/cd_jpop_s.html
Kuu has a few singles there, too. I hope this is useful to someone. ^^