If you need a whole groupset why limit yourself to a specific older one and not look at current?
If you’re hell bent on that then I’d suggest looking for the individual parts rather than a whole groupset as you might find all the constituent bits at bargain prices with a bit of diffing around.
Continental 2.4 Mountain King II Protection
If these are a particular favourite then you may have to do some digging or ringing around to see whole still has stock. Or try something newer, they might be better 😉
Seem to be in stock at various online places, or try your LBS, I’m sure they can order them in for you, likewise with specific parts for your groupset, what’s available from distributors is often much wider than what’s advertised on the big online stores.