Op shops like vinnies and the salvos are great for second hand baby clothes, so cheap! Also freecycle is great just do a search for it on google.

My DS loved his jolly jumper he would jump and spin around in it for ages!
Baby rocker came in handy too expecially when he was starting on solids we would feed him in it.
Small water bottles with rice and glitter make great shakers.
Aqium hand gel is great stuff!! Especially when you're out and need to clean your hands after changing bubs nappy. We still use it now (great for toilet training DS so much easier) $4 for a small bottle and about $7 for a big bottle at the chemist.
We didn't use the baby bath for long (it was borrowed anyway) as it was too heavy and awkward so DH just had a shower with him. We are going to use it this time however when our second DS is born so Callum can help bath him.

Can't think of anything else right now!