You can use cutting oil but it's not as efficient as Tap magic. I think Lowes carries cutting oil and usually hardware stores carry it as well. Cutting oil will also decrease the friction you get when tapping stainless but Tap Magic is "KING". Just be careful and don't rush and "back" the tap out of the hole frequently to clean out the tap threads.
PS - Cutting oil is not the same as regular oils, it's designed for cutting metal.
