Original models are still available through
GW Australia, which may prove about as expensive as buying them
OOP from eBay or the like.
That said, the new nurgle plastic minis are all dead easy to convert, and nurglising anything isn't too hard with a small amount of
GS, so that shouldn't be an issue really.
Don't fuss too much about the list. The standard contents of the old box.
2 Heros, Strong man and 5 goons does well enough. Think of them like a possessed band without the gribblebeast and you'll do fine.
Also wear a jester hat when playing, the jingling will give you the psychological edge.