There are so many things with high value that many overlook. My buddy's parents go to auctions/yard sales/estate sales/etc as a hobby. He told me his mother bought a box of crap for $5. Inside the box was a brand new, in the box, original Sony walkman. She listed it on eBay and got close to $800. His father apparently has a thing for hammers. He said he went in their basement one day to grab something and observed hundreds of freakin hammers lol.