That of course depends on the size of the case. (and whether or not that includes shipping) I've seen "cases" as small as 2 bags, though 3 is usually as low as anyone goes. (I still consider three-bag "cases" to be more like "half-cases") ABU's cases are 8 bags of 10 for a total of 80 diapers and that's a "proper case" imo, though I've seen cases out as far as 96 diapers. I've also seen "double-cases" of well over 100 diapers. So the more common case sizes seem to vary between 36 and 80 diapers, which is still a huge difference.
When I compare price, I consider how much diapers are, per piece, shipped, when bought in the largest case available, (to get the greatest quantity and shipping discount) as well as not counting sales. And for that, $1.65-$2.00/pc seems to be the going rate for high quality printed diapers.
I can wear a few good quality diapers during the day and overnight in a premium for less than I can eat lunch at McDonalds. I'm totally okay with that for a regular expense for wearing 24/7.