For sale is an 8 foot diameter Exploradome. I've owned this since last winter and need to sell it now because I'm remoting my telescope and the dome doesn't figure into the plan. These domes sell for $599 new and are made from extremely durable HDPE (high-density polyethylene). This dome is in great shape. I have not drilled holes or modified the dome in any manner.
I can't ship this due to size so delivery is by pick up only and you'll need help lifting the dome (the dome weighs 180 lbs). You'll also need a trailer, pickup truck (or larger) to haul the dome. I hauled it just fine from the shipper using my 2002 Dodge full-sized pickup truck so that will give you an idea what you'll need. It will NOT fit in a van!