Picked up some older sets on the Goodwill auction site recently that ended up being complete. The pair of vintage Blok Bots winning bid was only $5.99 while a $9 bid got me the Minions Castle Adventure set. While shipping was around $9 for both lots, they still seemed like pretty good finds. You do have to pay attention to the photos and descriptions, and always check the shipping costs in advance, but there are still deals to be had on ShopGoodwill.