For cyclists and hikers … Colter Bay campground does have a hiker/biker campsite. ~$15/night.

There are lots of pitches, with food storage, picnic tables and fire pits. No charging facilities, but I discreetly charged a power pack at night in the toilet block. Full facilities here, including showers for $5, laundry, cafe/restaurant and a really good and large grocery store. If you are coming from Yellowstone you’ll notice that the price of groceries here is back to normal levels for the USA, compared to the grocery stores in Yellowstone, which as we say in the UK, are taking the Micky (that’s the polite version!)