I'm a big fan of getting something for nothing, and I propagate most of my own (and friends') plants this way:
How to Get More Plants with Less Effort
If you enjoy gardening, whether it is with flowers, shrubs, trees or herbs, you know the excitement of going to your local nursery and buying new plants. What's not so exciting is the total when the sale is rung up. If you have a large property to landscape, purchasing new plants can cost you thousands of dollars. Sowing seeds is another option but it takes a long time, lots of coddling and an uncertain outcome.
One way to increase the number of plants is through vegetative propagation. Depending on the type of plant, you can vegetatively propagate through the rooting of tip cuttings or by dividing the clump. Each cutting or new division becomes a new plant that you've acquired for free.