Check out Storkbrokers.com to buy and sell gently used kids items. There are some great finds on here. If your kids grow out of clothes as quick as mine this is a great idea! I love how you can just pick what you want and need for your kids wardrobe and have it sent to your door. It's also a great way to make a little money back from all those clothes your kids can't fit into anymore.
I am so lucky to be a bzzagent at bzzagent.com because they made me aware of this neat site!