Can I make meringues with commercial egg whites?
Egg-whites in a carton are usually pasteurized. Pasteurized eggs are not great for meringue because the heat from the pasteurization process negatively affects the proteins in the whites that make for good meringue. With a lot of whipping (and more cream of tartar or other stabilizers) pasteurized egg whites (whether from pasteurized eggs or from cartons) can make meringue though it most likely won't be as stiff as those from non-pasteurized eggs.

I would suggest getting regular eggs and trying to use the left-over yolks for something like creme brulee.