The following links might be helpful:Canyon and Grant camps in Yellowstone. Looks like Grand Teton camps are all booked for my dates.
If anyone knows of some dispersed camping sites around Jackson Hole, let me know. I'm not familiar with 4 wheel camping laws in Wyoming, but many times National Forest Lands allow dispersed camping.
Bridger-Teton National Forest - Camping & Cabins
Bridger-Teton National Forest - Camping & Cabins
www.fs.usda.gov
Bridger-Teton National Forest - Camping & Cabins:Campground Camping
Bridger-Teton National Forest - Camping & Cabins:Campground Camping
www.fs.usda.gov
Bridger-Teton National Forest - Camping & Cabins:Dispersed Camping
Bridger-Teton National Forest - Camping & Cabins:Dispersed Camping
www.fs.usda.gov