A sling. The ante-natal woman was evangelical about them, but DS was bloody massive, really heavy and absolutely hated being strapped to me - he was just a wriggling, wailing, red-faced nightmare for the entirety of the one & only supermarket trip I managed before getting rid of the bloody thing.
A baby bath. Totally pointless. Just use the bath! Or a sink when they’re weenie. I had one of those little terry towelling deckchair things and that was great for sitting them in safely for a wash.
A Moses basket. Looks lovely, but gets used for a nanosecond before you need something more substantial.
Problem is, you’ve no idea what your baby will and won’t take to, so it’s pointless laying in anything but the basics. My best buys were:
Muslins. Used for absolutely everything (being used as dusters even now, when my kids are adults - still really soft and wash beautifully!).
A good pram that’s easy to manoeuvre and easy to collapse (one-handed if possible) and light enough to lift in and out of cars/buses/trains or up and down stairs.
A stable, convertible high chair that will work from newborn to toddler.
I was also given a little second-hand portable springy recliner seat by someone, and that thing was a godsend, got years of use with both mine and was then passed on to my cousin’s wife who used it for her three.
Second hand is the way to go for loads of this stuff. There’s a lot of barely-used, expensive kit floating around that you can try out for very little outlay, and just move it on again if it doesn’t work for you.