Fox ships them in units of 6 copies per box. The SRP per DVD is $14.98, so $14.98 * 6 = $89.88!
They are literally offering the un-broken-up brown cardboard shipping boxes full of six copies of this title for sale to consumers.
Sounds like a dumbass at this retailer input that listing, not paying attention to what it meant and/or not asking questions. The person probably assumed it was a box set, a la The X-Files or something.
Someone who just doesn't know any better. :rolleyes