Peppers is $15 a dog. "no exceptions"(written on the box) Before the gate, fill out the liability release/payment card, go through the gate and put the card and your money in the black steel box inside the gate. Also note, you're on camera
Cherry Valley is un-usable due to lack of maintenance by the WDFW. We have made some progress with upper management and the policies will be changing soon and we hope to re-invigorate the volunteer effort. Stillwater and Cresent Lake are also public ground. The WDFW has attempted to designate a small area to dog training at Cherry Valley only. Working on fixing that failed attempt to limit people's ability to recreate on public land.
Bert Carlson's Retriever Grounds is also a "pay to play". It's on Neal Rd in Fall City. $10 for the first dog, $5 for the second. There is a box at the Carlson's K-9 Country Club Kennel Office. Just put your money in the box. Carlson's retriever grounds are maintained(weed eating around ponds and mowing) by a real A-hole so, be real nice when you're out there.

I also use Meadowbrook Farms field in North Bend occasionally. It's a public park. No water but it's a good place for drill work.