Media is in the thick of auction houses...it's how I furnished my home. Bunches auction is at 202, south of rt 1. Their auction is on Tuesdays. Wednesdays you can find the action at Wilsons Auctions on Stoneybrook Rd, a left before the large Wawa gas station across from Concordville Pizza. Thursdays is Uniques in Aston, and Fridays the auction is across from the Booths Corners Farmers Market on Naaman's Creek Rd in Boothwyn. I'm sure you can find the phone numbers in the phone book/yellow pages.
I've only ever bought at Bunches or Wilson's, and know that at least Wilson's does clean outs. Or you can consign some things and toss others. Alternatively, consider a donation to charity and tax write off, or the old yard sale stand by.