thanks for the questions. well I decided to list only the items what you need guys. cuz ebay fees are horrible...

It depends... What singles do you need, guys? There are many... US promo, UK, AUS promo, Japanese, Japanese promo, EU, cardsleeve etc etc
There are many really rare CDs. Collectors know them. I kinda had all of the Kelly CDs
singles = 5 USD. But like I said.. it depends on the CD

I can ship worldwide. And I have paypal of course.