On Tue, 11 Oct 2022, Bill Gunshannon via cctalk wrote:
  On the other side of the coin...  I once tried to sell
a couple
 Chilton's car manuals.  The shipping price I quoted was the cost
 of a "If it fits, it ships" USPS envelope.  eBay refused to let
 me do it claiming the shipping charges were too high.  I haven't
 tried selling anything on eBay since.  (and I have a lot of stuff
 that just screams to be sold there!!) 
"Media mail" is the only practical option for those.
And, blank, or user-written diskettes don't qualify; according to the
post-office, only commercially written disks.