I can't find Rialto vouchers

Rialto Cinemas are apart of The EVT Group so vouchers can be found under the Event Cinemas movie offer.

Head to https://rewards.one.nz/#movies and click on the Event Cinemas image; "Buy EVENT Cinemas Vouchers"

You can buy vouchers for any of the 21 EVENT and Rialto Cinemas (Auckland and Dunedin) through this page.  A full list of the participating cinemas can be found here.