Fern Forest Treehouse in Vermont can be rented for $69/night on Airbnb:
The treehouse is a cozy little place perched on four maples 30 feet above a blanket of ferns. Access is by a ramp 70 ft. from the main house, where you’ll have a private bathroom with shower. This quiet accommo in the woods has heat, electricity, and a small refrigerator. The main floor has a single bed, or climb the ladder to the loft with a queen sized futon and down comforter. Enjoy the comfy reading rocker or sit on the deck and gaze at Mt. Abraham and the Green Mountain National Forest.

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I’m bookmarking it for my next trip to Vermont.