Briskheat has made an interesting entry into the roof and gutter pre-terminated self-regulating kit market with a kit that bundles accessories as well. It has clips, downspout hangers and twist ties along with 50, 75 or 100 foot length cable https://morelectricheating.com/products/MANUFACTURERS/BRISKHEAT/SPEEDTRACE%20ROOF%20@@26%20GUTTER%20KITS@@3a%20PRE-ASSEMBLED%20SELF-REGULATING%20HEATING%20CABLE%20KITS.aspx