Festival organisers Facebook group suggest the following options:

A quick update on the ticket status – all online tickets are sold out. There are a few at our over the counter ONLY locations. http://bluffoysterfest.co.nz/node/57

We don’t have a problem with people on selling tickets they bought of us on Trade Me but only at face value – scalpers not welcome.

If you are needing tickets keep an eye here and on Trade Me. The Organisers can not supply anymore.