I'm shopping for baby gear, too.
I plan on buying new: car seat, car seat bases, crib, crib mattress, Pack and Play.
Things I'd be okay buying used but will probably end up buying new: Stroller (I want a nice one like the City Mini...would only consider used if in excellent condition), baby carriers (infant and one for bigger babies like an Ergo), cloth diapers, crib bedding (sheet, decorative blanket, crib skirt).
Things I'm actively looking for on Craigslist/thrift stores/rummage sales now: rocker/glider in good shape, white dresser that can double as changing table, baby swing (a newer model), clothes, barely used cloth diapers, maternity clothes for me.
I have tried negotiating on price with Craigslist sellers who are selling a used item at only 30-40% off what a new one is going for on
Amazon, and most are not budging. Unless I find a great price on some of my Craigslist finds, I'm waiting until rummage sale season starts to make most of my purchases. I think sellers will be more willing to part with their stuff when I'm standing there with the cash in my hand ready to buy.