So, what have you found to be the most economical way to buy formula?

I'm not interested in switching brands because DS has dealt with reflux and we tried several already. We're on Enfamil gentlease.

I'm disappointed there isn't a very good option for subscribe and save on amazon. I've been buying the box of refills for the plastic tub and using checks when I have them toward that. And I stock up when Target has the "Buy $X of baby stuff, get $X gift card" offers.

Are there other ways you've found to save on formula?

I like to keep some ready to eat on hand for emergencies, but will only buy it with checks so we don't spend much on that. (It's usually about $6 for 6, so I use the $5 coupons on it)