I recently made my own. It uses a 200W lightbulb, foil lined with a temp gauge. I wanted to keep it cheap, the most expensive parts were the shelving, 1/4 chicken wire, casters, temp gauges. I had the sheeting laying around, but the other lumber I had to buy. It works great, dries 5 large shelves of jerky 17" x 20" in about 24 hours. I have a inlet in the back bottom for air to come in, and an exit near the front top for the moisture to escape. It was a great project, total cost about $80.00.