One use per account and you have to register a payment method first.
- Sign up/ create a new account
- Go to My Grays
- Go to the "Account" tab and choose "Payment"
- Fill out your payment details. I chose Paypal and got this message:
You have authorised Grays to debit funds from your PayPal account with the following email address… - Go to checkout, with at least $20 in your basket and add voucher code
If you want to un-authorise Gray after your transaction is complete:
- Go to Paypal
- Under recent activity choose "Details" of your Gray's purchase
- Ensure the status is complete
- Go to "View Billing Agreement Details"
- Cancel future authorisation
A lot of bargains to be had with free delivery (limited time) thanks to this OP http://www.ozbargain.com.au/node/99712
Batman Arkham Asylum GOTY PS3 for $14.20 delivered seems decent?