Ericaceous soil for Acer (Deal)

Has anyone got a tiny bit of soil please? My little Acer, the smallest size in a 30 cm pot? I think. Is suddenly looking depleted.

I'm moving home soon, and also only have the one, weeny tree, so there is no point in buying a vast bag!

If anyone has a bit of soil, would be so chuffed!

Huge thanks
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