J.W.
S.,
We just visited a store this weekend that was awesome! They sell used kids stuff and they buy stuff on a couple days a week. They were located in Bellevue right off Highway 370 and 72nd Street. The name was Bigwheels 2 Butterflies. Give them a call. All of the things there were pretty reasonable and the clothes were in great condition. Based on the prices of the clothes, I'm not sure how mucyou'd get for your clothes but it's worth checking out.
Jenny