Price (as of 1 Sept 2017):

Annual All Park Pass Unlimited entry into all WA fee-paying national parks for a year. The pass is valid for one vehicle*, with up to twelve legally seated people. Special price: $46.00*
RRP: $92.00
Annual Park Pass
Concession Unlimited entry into all WA fee-paying national parks for 12 months for Australian concession card holders only. The pass is valid for one vehicle*, with up to twelve legally seated people. Special price: $29.00*
RRP: $58.00
Holiday Pass Unlimited entry into all WA fee-paying national parks for up to four weeks. Valid for one vehicle with up to twelve legally seated people. Special price: $23.00*
RRP: $46.00
https://rac.com.au/travel-touring/wa...f6fc315-pane-1