GREAT places to buy baby clothes without spending much money is ARC or Goodwill. Generally you can find several things that are gender neutral there and with what you are spending purchasing a couple gender specific items isn't a bad thing either.
The other day I walked out of ARC with 6 two piece outfits, 4 one piece romper outfits, jammies, fleece jacket, fleece overalls for $18. Well, it does help a little that I try to shop sale color tag only unless it is just too CUTE! It also doesn't hurt that I am off and on shopping for my little girl due in a couple weeks but I do try to add a bit here and there to my gender neutral stash cause you never know what this Jan babe brings.
Another nice benefit of shopping there is that you can shop ahead for different seasons based on about what size they may be in 6 months. I have come across several things over many trips for winter. Heavy fleece overall type outfits with matching long sleeve onesie. For M I got her an insulated bunting with hood, foot and hand covers for $4, something that easily would have cost $35 or more.
A few weeks ago I also picked up a few practically brand new crib sheets that I liked. Months ago I found a rubber sheet for $1 same kind I remember my mother using for us kids. On top of that I have kept my eyes open for different types of receiving blankets that I love in the sale tag color, usually $1 each.
I have very few items bought new, all of which were purchased for me and not by me. Most things from ARC look/are new.
I hardly got anything at my baby shower and I didn't want to rely on others to buy the clothes. I've had to slowly, post shower, buy stuff that I registered for.