I use craigslist for bigger items like strollers, carseats, furniture.  Why buy a new one when you can get a gently used for half price!  I also love sites like groupon, living social and seize the deal to get half price deals at clothing boutiques.  I never pay full price for children's apparel.  Carter's, Target and Old Navy always have good clearance sections that you can get clothes for $2-$5.