I like whatever smells good for the soaps! As long as the baby doesn't have any sensitive skin issues, you can use anything. Find what you like best.
As far as the gas drops go, you can get the generic .Walmart brand. It is the .E.X.A.C.T same thing as the expensive name brand but way less expensive!!! Same goes with a lot of baby supplies, really.
Go to every website you can find (huggies, luvs, pampers,etc) and sign up for their coupons. Also formula sites (enfamil, etc). Get as many people sending you coupons as you can. That way, you'll have them if you need them!
Stock up on a few packs of diapers (if you are going to use disposables) beforehand, you don't want to run to the store with a new baby within the first few days of being home because you are out of supplies! ;)
do you have a thermometer? Nail clippers? I can't think of anything else. Film! And batteries!!