Just saw this and on Gumtree, not black though.
KEF LS50 single speaker only,
https://www.gumtree.com.au/s-ad/forster/speakers/kef-ls50-single-speaker-only/1249986506?utm_source=com.samsung.android.email.provider&utm_medium=social&utm_campaign=socialbuttons&utm_content=android_VIP_sticky
Price: $500.
Sent from Samsung tablet.