Yesterday I order 5 D3 on Bitmain when they open new sale. Now I want to sell 2 D3 with price is 2699 + 2699*0.05 = 2833 USD (5% is my bonus for order :)).
Support of bitmain say it is possible to exchange contract.
If you interested in, please comment your email or inbox email with me. We can talk more details.