Like I suggested to someone else...become "postal buddies" with someone near you, who has access to a Hobby Lobby. For $50.00...you can build up quite a "spare parts collection" buying nothing but the $7.00-and-under Estes and Quest kits at 50% off. Can you ever have "too many" Baby Berthas? (Or Quest's "Full Moon" --- one of my favorites...)
:o)