If you're looking for DCM and can't find it (you're not looking hard enough, visit a shop that uses it to join sheets of plexiglass together), consider using TCE. TCE, or perc, or perchloroethylene, is used as a solvent to clean brake lines. It evaporates quickly, doesn't smell quite as nice as DCM. It's BP is higher at 120C and can substitute in a lot of places for DCM (ie for separations, as it doesn't boil at the same low temperature, it can't substitute everywhere...). Plus TCE is better for the environment, it breaks down more easily and isn't as soluble in water.