Hi J.,
Congratulations on your new little one. Whew, I know you must be trying to keep cool about now!
You will love wearing your baby! Here is a website with TONS of info on baby wearing www.thebabywearer.com.
I use an unpadded ring sling most often. I also have a mei tai and an obi. I used a water ring sling for my dd last summer since she was an infant. That was very useful for taking her and her older brother to the pool! W/ my 5yrold ds, I bought an Over the Shoulder Baby Holder which is a padded sling, when he was an infant. It is nice, but not nearly as versitile as and unpadded ring sling.
I make ring slings that are really cute and affordable. I make them out of two coordinating fabrics and they have pockets which come in very handy! YOu can even pick out the fabrics you want so it can be completly custom made. I charge A LOT less than most slings you'll find being sold on the internet. I can also help you learn how to use it.
My friend makes really cute obis, but that is for older babies (can at least hold their heads up well).
If you think you'd be interested in one of my slings or my friend's obis feel free to contact me. Also, if you just would like some tips on wearing your little one once he/she arrives, let me know. I'd be glad to help, even if you don't buy one of my slings.
Also, if you sew and money is really tight, there are lots of patterns on the internet to make your own. You can buy rings at www.slingrings.com. Don't get rings from just anywhere because they aren't all strong and safe enough. That site also has links to patterns. If you search on www.youtube.com there are lots of how to baby wearing videos.
Good luck in your search.