
$58 3-hour "river float" (easy rafting) or $73 for an evening float with supper. On Snake River, starting in Jackson Hole, within the Grand Teton National Park.
Nevada: I like the sound of Seven Mile Canyon Ranch ($170 pp per day, plus activities) in Virgina City, which looks like a really nice town. But their website doesn't seem to work.
Wyoming: The cheapest week-long dude ranch experience I've found is at the CM Ranch in Dubois, WY. Two adults and a baby about $3700 all inclusive. I looked at 30 dude ranches in Wyoming, they are all very similarly priced and none accept shorter-than-4-night stays in the summer.
Colorado: About 30 dude ranches are listed here, I haven't looked at any but assume they are similarly priced to the ones in Wyoming.
Reservations for campsites must be made by phone if we want to stay inside the park. Showers are only available at Canyon and Grant Village campsites!! $20 and walking distance to good stuff (restaurants, sites, trails).
Otherwise we can stay 6 miles outside the Yellowstone West Entrance at a KOA site that has a pool. Camping costs about $40. Or, for under $100 we can stay in a cabin inside the park (shared bathrooms) if booked a few months in advance. The cheapest are $66.
Reservations for everything should be made about 2 months in advance, or as early as possible if we want a campsite in the park within walking distance of a shower. Some campsites in the park are first come first serve so even without a reservation we stand a chance, but in July and August they fill up by 8am...