Instead of paying top dollar for the diaper disposal systems, I created my own by lining a trash can with layers of grocery bags. Each time I change a diaper, I tie the grocery sack. At the end of the day I tie the last one (with all of the others inside) and take it out. For older kids (with stinkier diapers), I've found that adding a little Arm and Hammer Baking Soda to the grocery sack helps.
