Due to the nature of my work, I receive data on CDs, so I have a lot of empty cases. I believe they've basically only been used once. I can't confirm with the sender, though... There are some with white backings and other variations, but I've gathered those that appear to be the same. Major online shops seem to sell them for just over 1000 yen for 50 cases, plus shipping... I have 37 cases in total, and if you buy all of them, the shipping will be 750 yen, so the total will be 900 yen. 40 cases weigh just over 1500g. I have more if you include other colors. I would like to sell after we've communicated.