I have the following Bitmain coupons for sale, looking for 25% of face value.

1 x 450 USD expires 2018-06-10 23:59:00
1 x 400 USD expires 2018-06-30 18:23:00
2 x 200 USD expires 2018-06-01 18:13:00
1 x 100 USD expires 2018-06-01 18:10:00