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You can purchase fan-fold foam board from Hope Depot, Lowes, and Menard's, although I needed to special-order mine. It is about a quarter of an inch thick, so it should be really easy to handle, but I would recommend just purchasing thin sheets or use a wire cutter on heavier ones, this comes with a thin layer of plastic with many perforations. When I tried to peel off the plastic, it hit the holes and just shredded, it would be way too much work.
I mention this because it seems like two layers of fiberglass with foam in between is the best solution and I wondered how much foam you really needed.
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