I'm sure you can do the math. Alas, the cost is only going to climb from here.
After reading many awesome reviews about the product, we've decided to switch her to the Target Up-&-Up brand. We decided to try the version that is supposedly comparable to Enfamil Gentlease to prevent gas and spit-up issues at less than $15 per 24 oz. container. Honestly, it's been wonderful. Abbey didn't seem to notice a difference in the slightest and we've had no apparent tummy troubles as a result of the switch. I personally don't believe she is spitting up any less per se, but she does exhibit significantly less gas.
So for any FF'ing mommies out there who are considering making a switch, I give an enthusiastic two thumbs up for the Target Up-&-Up formula.