Flexwatt is most easily found at all of the above sites. But, just an interesting little piece of knowledge. Flexwatt can be found at some hardware stores. Flexwatt was originally designed to be used on roofs and stairways, to melt snow and keep the weight from possibly collapsing a roof, or to keep stairways clear of snow and ice, posibly creating a slip hazard. I live down south, so have not found any at any type of hardware store, but I imagine that up north, you might be able to find it. Just thought some people might not have known that.