If you haven't seen this, maybe you should check it out. It's like a garage sale online. Pick, List, and Send. You pay $5 + $10.95 s&h and get a box of used clothes for your child. When sending you don't have to pay shipping because the recipient pay's for it. The post office sends you the box, and you can choose for them to pick it up at your house, or drop it off at the Post office.
It's a pretty cool idea. I haven't tried it yet. I am still browsing.
Let me know what you think about it.