https://www.amazon.co.jp/b?ie=UTF8&node=8004683051
Ayu's storefront page on Amazon.co.jp
It appears that Amazon has been doing these for a few artists and Ayu's were just recently introduced earlier today! They appear to be versions of CD jackets/DVD jackets that are printed at 2x the size of normal releases (12cm x 12cm -> blown up to 24cm x 24cm) to display as art or frame if you'd like. A handful of albums and DVDs have them available alongside purchase.
Currently they seem to have the following available:
FIVE
LOVEppears / appears - 20th Anniversary Edition
A BEST 15th Anniversary Edition
Duty
A 50 SINGLES
(miss)understood
ARENA TOUR 2015 A -Cirque de Minuit-
LOVEppears
A COMPLETE
POWER of A^3
A BEST
A MUSEUM
A BEST 2 -BLACK & WHITE-
A Song for XX
MY STORY
I am...
ARENA TOUR 2016 A -M(A)DE IN JAPAN-
Samples of other mega jackets for scale:
Some Japanese fans have taken this addition to Amazon to maybe hint at a new release coming soon perhaps.