Pampers Baby Dry Diapers Size 6, 128 Count $17.40 w/ 20% Amazon Family (Prime) S&S Discount

https://smile.amazon.com/gp/product/B00DDMITLO/
Size 6 only. The price is $21.75 before the 20% Amazon Family Subscribe & Save discount, $17.40 after. Quantity limit appears to be 4.
This deal is 20% lower in price than my from 2 days ago.
Other sizes are still priced much higher.
Note: I had to cancel my S&S orders from 2 days ago in order to take advantage of this lower pricing due to the quantity limit.