yup, you can make your own. It's not even hard!
1 cup sugar
4 Tbs butter
3/8 cup water
1 1/2 cup instant dry milk or heaping 1/2 cup non-instant
Combine sugar, water, and butter in a small saucepan and bring to a boil, stirring occasionally. Cool slightly, then mix in dry milk (using beaters or a blender to make sure it's thoroughly mixed).
Refrigerate, covered, until needed