There is a big difference between "at 90%" and "90% off".

Your subject line is saying about getting buying products at ebay for 10% as you have mentioned as 90% off whereas in open-post you are saying at 90%. Which one is right?

How it will be possible to give discounts for BTC payments? Usually this type of services are provided by hackers with stolen cards and after people send you BTC their products will be denied and law consequences also possible for using stolen cards.