30% off Select Fisher Price Happy Days and Nights Box Diapers

Update: It appears the Size 4 Subscribe & Save discount is no longer available. If it shows up for you, please leave a comment and let me know!

Amazon currently has some of the Fisher Price Happy Days and Nights Diapers 30% off with Subscribe & Save as well.

Size 3 diapers (96 ct) $19.99 $16.99 (this is only 15% off)
Size 4 diapers (82 ct) $15.49  $10.84  sold out at this price
Size 5 diapers (70 ct) $19.99 $16.99 (this is only 15% off)
Size 6 diapers (60 ct) $19.99 $13.99

What is really nice about these is that come in a day/night combo pack to match your usage needs. I have tried the daytime diapers before and really liked them. Does anyone have any experience with the nighttime diapers?