Plastic wrap is easily available, and can be secured with a rubber band. Place greenhouses in bright light, but NOT direct sunlight as you don't want to "cook" the cuttings. Check progress from time to time, and if desired, you can spray or mist the cuttings. Within two to three weeks you should have firmly rooted cuttings, ready to be transplanted. With six cuttings done this way, you have just saved about 30 bucks! Congratulations!