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Alum? Look in the spices section at your supermarket. McCormick packages approx. 2 oz of alum in a small jar . . . kind of a rip for the price asked for that amount, but then, you don't need much. Your local pharmacy may also have it.
Gatorboard is certainly a workable choice for panels to use for canvas supports. Available in 4'x8' sheets in thicknesses from 3/8" to 2", it's amazingly flat, rigid, stable and light in weight. Only drawback I see is that styrofoam core, which won't add much Old World ambience to perceptions of what a "fyne arte" oil painting should entail . . . you'd probably want to camoflage this aspect for the sake of your clients' peace of mind . . . styrofoam has a way of being negatively associated with fast-food packaging.
I believe "New Traditions" is one maker of canvas panels on foamcore board.
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