HD sells it by the gallon. It's called 'Klean-Strip Fuel' - search their site for sku 126454.Its pretty cheap at most drug stores. What I do is buy the empty spray bottles in the cleaning section and screw the pump right on to the isopropyl bottle and just hose everything down. It evaporates fast. Its also very flammable so don't use it on a hot powerhead. Its also the best thing I have found for removing pitch.