Thinks I've found handy:

Bunny rugs and wraps, you can't have to many. We mostly use a portable change mat with raised sides instead of the change table. Buying second hand where possible (I got a baby bath for $3)and accepting things from friends. We were given sooooo much stuff and it saved us a fortune. Buying things like wipes in bulk. Also for my baby shower I asked for gifts like powder, breastpads, wipes, creams, nappy bucket etc. I was able to be fully stocked up and wont have to buy any of these things for ages.

Things that were wasted:
Only 0000 bonds wondersuits so far. Get 000 as they grow out of 0000 very quickly! Even my 4 week premmie DS grew out of these by 5 weeks old.