My youngest is now 13 but I still thank my lucky stars I got a simple roll up-able changing mat that I could take with me or use at home. It was sort of quilted in rows, with terry cloth on one side and machine washable vinyl or vinyl-like material on the other. It was absorbent and easy to put in a large handbag along with a few disposable nappies and a small packet of wipes so as they got a bit bigger than newborn stage it was easy to get out without looking as if we were heading off on a polar expedition. I could throw it into the washer and dryer if it needed sanitising and it lasted through five babies. Like this only dead cheap and in white.
I never had a changing table -- just used the mat on a bed or the floor, or in the car, etc.
I bought some lovely birdseye nappies and used them as burp cloths. Saved many an outfit, and afterwards they were really useful as household cloths -- very absorbent.
An extra large insulated mug to keep tea or coffee good and hot for hours. Nothing worse than pouring yourself a cuppa and not being able to drink it because you are feeding the baby and can't risk spilling it on him or her, or putting it down and finding it's cold by the time you get around to drinking it..
Tandem cot that clipped onto the bed. Allowed co sleeping without a crowd in the bed.
Bibs that slipped on over the head like the neck of a Tshirt and extended all the way over the lap of feeding toddlers. You won't need these for a while and you could actually make them yourself out of oversized toddler T-shirts if your name was Martha Stewart .
A cover for supermarket trollies to keep the DCs from licking and sucking on the handles.
If you buy a snowsuit, get one with nylon or satiny polyester lining. Avoid fleecy or flannel linings in snowsuits. Yes they are warm, but they are really hard to get little arms into. I bought one with nylon lining by sheer dumb luck and even though it was pink none of the DDs ended up losing brain cells and DS didn't turn into a girl.