When I rode the Pacific Coast, we stayed at a lot of state park hiker biker sites in Oregon and California. One California park, I think it was Manchester Beach was almost an embarrasement as campgrounds go, but we stayed there for one night. Had planned to take an off-day and stay for two nights, but the next morning I checked out the KOA that was less than a mile away. They offered a hiker biker rate that was higher than the state parks but much lower than motor vehicle rates, so we moved next door to the KOA. But that was only the second time I stayed at a KOA in several decades.

I took the photo at a California state park campground in Summer 2014, hiker biker site at that park was $5, but sometimes was $6 or $7. I think the California showers were coin op, for about $0.75 or $1.00. Oregon showers were free.

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On the topic of great camping sites, I have nothing but good things to say about the campgrounds in Iceland. Almost every community has one, plus a few commercial ones too. Fee was per person, during Summer 2016 I think I paid in the range of $8 to $12 USD but one place I paid about $15. (At that time, currency conversion was at $1 USD to 123 ISK, fees of course were in local currency.) All of those included showers, sometimes had community sinks for washing things, etc. I do not think they ever turn anyone away, which is important to a cyclist. If you could find a place to pitch a tent, you could stay there.