Ski equipment rental shops in Buller can be found both on the slopes and in the town, as well as in other settlements on the way to the resort. The latter option will be considerably cheaper.
You can rent skis and snowboards in specialized centers or in hotels where the service is offered to guests. For example, those staying at the Arlberg Hotel can rent a ski set for 1-7 days for 53-171 AUD respectively, and a snowboard set for 45-145 AUD. For AUD 15 you can exchange one set for another during the rental period.