I use Burnout 2 in the hot summers and a flame weeder in the cool seasons. They complement each other nicely. A flame weeder by the way is like having a BBQ on a stick. It cooks the weeds. That's how I deal with the cost difference between RoundUp and Burnout 2. Propane is much less expensive than RoundUp and Burnout is more expensive. It evens out the cost in the end. However, I don't have an exact price breakdown for you so I'm not sure if my combo is less or more expensive than RoundUp in the end.