To make sure I'm never without reeds, I have adopted what I call the "hydra method" of replacing reeds.

The hydra was a mythical serpent monster with many heads. If one head was cut off, two more grew in its place.

When a reed gives up the ghost and has to be sent off to greener pastures, I replace it with two more. This way, I'm never to the point that I run out of healthy, usable reeds and can keep rotating them and not get the in the habit of always playing the same reed.