Have you heard of Thred Up?
From the website:
Because even the most obedient children can't stop growing, thredUP provides a place for parents to exchange gently used clothing, toys and books for items more suited to their children's needs. Members search for just-right boxes, which are sortable by gender, age, size, contents, season and more. Once a box is chosen, members pay $5 plus shipping, and can begin compiling his or her own box of last year's turtlenecks, and mail them to another mom for free.
If you have never tried Thred Up, you can try 2 boxes for only $16 thru this deal! That is only $8 a box and inlcudes shipping! ($32 value)
This is only available to new Thred Up members.
Go here to see the deal.