You know the Discovery box (see picture) that holds 9 of ELO's Sony Paper Sleeve Collection CDs. A box alone just sold for $102.51 at auction on eBay. Just the box. They are official, if not approved, collectors items made from a company called Disc Union for many groups' paper sleeve series, but wow.
There are other empty boxes for sale (not just ELO) I'm having considerable trouble finding for under $50. Again, wow.