We got (for #3, since I needed to start from scratch for #2)

A bassinet + some sheets and blankets (which I got gifted)
Some clothes - despite them being polar opposite seasons, I had quite a bit of neutral coloured wintery stuff in between all the pink summer stuff
Nappies
Car seat (which just happened to come with quite a few bassinet sized sheets and blankets)
And out of season maternity gear for me

The whole lot added up to about $250. Second babies are cheap!

If I'd had two of the same gender in similar seasons I would have only needed cot and carseat.