You can purchase a Discovery Parks Gift Voucher by calling (08) 8219 3000 and selecting '2' for Discovery Parks or going to the Vouchers page on the Discovery Parks website. https://www.discoveryholidayparks.com.au/vouchers
Discovery Parks Vouchers are only redeemable for accommodation and are valid for 3 years. They can be purchased at any value from $50 to $500.