You need to check with some of the local sporting goods dealers around your area. But in all reality I doubt that you will find anyone that is willing to rent you one just due to the liability issue of it.
One other thing you might look at is buying one. There are some good cheap ones out there that you could buy for about the same price that you might be able to rent one for.
Lone Wolf Treestands is a newer high end stand. They are incredibly light which has great advantages when carrying it through the woods. You also can't go wrong with Ol'Man. They have been around for awhile and their new Drone with the Hex drive is very convenient being able to level yourself while up in a climber.
Let me start by telling you the story of two Johns.
John number one went on a day hike with a couple of friends in the Cascade Mountains about an hour from Seattle. He somehow got separated from his buddies and became lost. John was dressed in casual cloths for a warm weather day hike and had nothing but a lunch with him. He spent three days in those mountains and luckily made it out to tell the story.
John number two, a friend of John number one, was much better prepared when...