avex Hong Kong do make CD only's of her stuff (selective & not sure why so) but they're not like avex Taiwan that makes all of them for both her singles & albums
If you see
http://www.avexasia.com/products.php...1303&type=8604 , it contains the breakdown details of her material
AVJ - the 1st 3 alphabets for avex Taiwan's catalogue no.
AAJ - the 1st 3 alphabets for for avex Taiwan's catalogue no. . The old format used to be AVT before it got changed to AAJ