Just saw over on amazon that QNAP has a couple of NBase-T switches for sale now. Could be interesting however they are unmanaged. Comes with rackmounts and appear to be fairly quiet the larger one is rated at 18.7 dB(A)
Smaller one is 8 ports 10gbe sfp+ with 4 of those shared with Nbase-T ports - 489$
Larger one is 12 SFP+ ports with 8 of those shared with Nbase-T ports -573$
https://www.amazon.com/dp/B07CDJ9YG...49e5e94637fd&ie=UTF8&qid=1531137040&sr=2&th=1
QNAP spec page for the 12 port
10GbE Switch: QSW-1208-8C - Hardware Spec
Smaller one is 8 ports 10gbe sfp+ with 4 of those shared with Nbase-T ports - 489$
Larger one is 12 SFP+ ports with 8 of those shared with Nbase-T ports -573$
https://www.amazon.com/dp/B07CDJ9YG...49e5e94637fd&ie=UTF8&qid=1531137040&sr=2&th=1
QNAP spec page for the 12 port
10GbE Switch: QSW-1208-8C - Hardware Spec