Definetly a listing error/price mistake. And, yes, the shipping weight says 13 oz, but I ordered two "cases" four days ago and they were delivered today! Go now, before they fix the error!
I figure you could fit four cases in one Pantry box. (At least the sized box they sent me.) You should still have room for a few of the The First Years Stacking Up Cup sets at 32¢ each still.
As of this edit:
Price: $2.50 ($0.23 / Fl Oz) Prime Pantry
Only 8 left in stock. Ships from and sold by Amazon.com.
Exclusively for Prime members.
Attached picture is of one of the cases I got today.