be careful, after reviewing different threads, forums, ebay and many other sources, it seems that most if not ALL high value Bitmain coupons have expired by the 15th of July 2018. So it is very unlikely that you will find a valid coupon, that's why you don't receive any answer.
Ragards,
Marco
Hello,
I am looking for bitmain coupon $420 which I can buy in very cheap price and I will do the payment using paypal. I noticed some sellers sell for $50 or cheaper.
Please pm me your offer if you are interested.
Thank you