Also i saw a FoodTV episode in which Paula Deen made her own. Maybe this recipe would be helpful to you as well.

Homemade Sweetened Condensed Milk

1/3 cup boiling water
4 tablespoons butter
3/4 cup sugar
1/2 teaspoon pure vanilla extract
1 cup powdered milk (recommended: Carnation)

Using an electric mixer, blend together water, butter, sugar, and vanilla.
Add powdered milk and blend until thick. Store in refrigerator for up to 1 week.I hope this helps.
Debbi