I've learned of Imperial Baking Margarine that's wrapped in 1/2 cup portions. I made a batch of brownies with it the other day and they turned out great - wouldn't have known it wasn't butter if I hadn't made them.
Has anyone used margarine to make buttercream or lemon curd? Those are two recipes I make all the time and takes a lot of unsalted butter. A pound of butter costs at least $4.99 and three cups of Imperial Baking Margarine runs at $6.00.