I agree with lestyrox, Ebay is a great way to source great baby things in exellent condition. Babys dont stay little for too long so you can end up spending a fortune on baby clothes and baby never gets to wear them.My girls always look great but I havent spent a fortune on them, and nobody would know that the clothes are second hand.
Another good idea is to take someone who has kids shopping with you so you dont end up buying things you wont need/use.