I imagine this is really more for future reference for us than for anyone else, but we recently bought a Pampers Baby-Dry Diapers, Economy Plus Pack via Amazon. We've had the best luck with these diapers. The Costco ones worked okay in size 3 but the size 4 ones blow out every time on Ezra. For Pampers, we haven't noticed a difference between the "baby dry" and the "cruisers" other than the price.
This is the second time I've bought this size diaper pack from Amazon. I believe last time they were on sale. The price puts it over the free shipping threshold which supposedly takes 7-10 days. I got nervous we were going to run out this last time and bought some more diapers at Target. Too bad, because the Amazon diapers were delivered to our door in just a few days.