Soil for a small pot (Deal)

I've successfully rooted some Rosemary that a kind neighbour allowed me to take some cuttings of, and would love a small amount of soil for this pot. I think it's 30cm?

No point in buying a HUGE bag of soil that I won't use as I'm moving home.

If any one can help, would be so chuffed.

Huge thanks in advance. xxx

Am in Deal CT14.
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