You can buy you DO codes very easy via Autobuy option.
And grap your AWS $200 codes.
Thanks to all DO buyers!
My account has been used with one of the code I got from my github education pack, does it able to use again? Thanks.
(Please PM me if possible, I'm scared I didn't notice your reply)
Edit:Never mind, just figured that it's not stack-able
DO codes can be used only 1 time for new accounts.
So the only thing you can do, create a new acc with new pp acc and add the code.