Planning a Trip to Yellowstone, Grand Teton and Craters of the Moon

We are planning an August trip to Yellowstone and have made reservations at Fishing Bridge Campground. We are planning to stop at Craters of the Moon in Idaho and hope to spend a couple days in Grand Teton before heading into Yellowstone. Does anyone have campgrounds or RV parks in Grand Teton to recommend? We would not require hookups, but wouldn't be opposed if they're readily available. I have researched the links on the NPS website for Grand Teton camping. Several RV parks are available, but seem expensive. I don't mind spending the money if it's worth it and would appreciate any feedback that you have.

Thanks