Baby things. When should I start?

Yellow mellow
I'm due sept 30. So I was thinking when to purchase baby crib and other things for the baby. Some people are saying to wait till next month. When did every one else start baby shopping? & would you purchase baby crib online or from store which is expensive, any suggestions? I'm planning to buy online because I'm on a budget.
Ok you know what I should start buying everything now because there's many things that needs to be done. I don't really want to wait to on my husband to go baby shopping I'll just start shopping asap. I do realize there's a lot of things to buy for the baby. Thank you ladies, I should go ahead and start baby shopping!