Free: Contests & Raffles.
I will say the idea to get rid of the discover pass itself is a great one. We live in a day where the police have access to all your information in their car, why the hell do I have to bother buying a piece of paper that proves I'm authorized to access land? To top it off, its not like the america the beautiful or NF passes where its valid on any vehicle, I still have to validate it for two vehicles only! Why not just buy it on WDFW, put in your two vehicles and you're done.
The Discover Pass was created to pay for State parks. The problem is that is accomplishes exactly the opposite of what it should accomplish, fewer people use state parks. Because hunters and fishers use other state lands and facilities they are getting stuck funding state parks that most never use. I'm a firm believer that the state parks should be funded by a small amount from everyone rather than a large amount from hunters and fishers. In addition, with some business minded management the cost to fund state parks could probably be drastically reduced!