Getting to the Hiking the Tetons Program from Yellowstone

I will be taking part in the Best of Yellowstone program that starts June 18. The program finishes Saturday, June 24, in Gardiner, MT. On Sunday, June 25, I begin the Hiking the Tetons program at Murie Ranch near Jackson, WY.

I have found out there are no car rentals in Gardiner and there does not appear to be public transportation. And the only transportation that can be arranged through Road Scholar is to take a bus to the airport in Bozeman, this taking me substantially in the wrong direction from the start of the Hiking the Tetons program at Murie Ranch.

Any ideas or suggestions? Is there anyone driving past Gardiner on Sunday, June 25, in the direction of Jackson Hole?

Thanks much!