It is actually the same as a ZYXEL GS-108B v3, and many many more.
ThunderData is a small OEM manufacturer in Guangdong, China. They designed a basic switch. Here is the board. It is pretty simple, nothing fancy, probably not more than about $30 assembled.
They also offer it in a nicer case to other manufacturers, still with exact same circuits and clock. Here it is as the Nuprime Omnia SW-8 at €499
“NuPrime licenses Omnia SW-8 from Thunder Data Co. Ltd., maker of Bonn N8. Omnia SW-8 differs from Bonn N8 with an upgraded low noise power supply and aluminum chassis”
And then as here it is branded by English Electric as the 8Switch
£450 (note currency change & difference) but ships with a 0.75m C-Stream cable worth £40.