If you want to do an uber-cheap makeover, there is no need to buy two curtains for every window. I always cut my curtains in half and utilize them for two windows. Most curtain panels are around 60 inches wide, so even when they're cut in half you can still cover a typical window, which is 3 or 4 feet wide. And if your windows are short, you can cut curtains in half horizontally.
What Amberly Saves: $250