This week's book giveaway is in the OCAJP 8 forum. We're giving away four copies of OCA Java SE 8 Programmer I Study Guide and have Edward Finegan & Robert Liguori on-line! See this thread for details.
I don't think the voucher are transferrable any more. These prometric people will book the voucher against the Unique ID proof and address proof. If you don't produce those document, you are not allowed to take the exam. So Stop looking for the voucher