My son is 8mths old & I have never paid full price for a can of formula (DS is exclusively formula fed). I will buy whichever brand is on sale & whichever one I have the best coupon for. My DS has tolerated every brand except the
Walmart. That made him constipated.
I signed up for the coupons w/ every formula maker. Similac sends the best/most coupons...they were $5, now they seem to be $4. Sign up for everyone in your family who doesn't live with you. I get them sent to my mom, grandma, sister...
While I agree that all formulas are the same as far as nutrition, they are different. The texture is much different...I HATED the BJ's brand & Target brands...the powders were thick & lumpy & just didn't mix well. I like Enfamil which was the best texture-wise (mind you...
I like it the best, DS doesn't care

) but they rarely go on sale around here & they don't send many coupons.
I am running out of Similac coupons now, they are sending them less & less...maybe b/c DS is 8mths? I don't know why. I will be switching to store brands unless I have a coupon.
My ped says it's fine to use whatever brand, and switching between them is fine...as long as you stay w/ the same type...don't swap milk based, soy based, specialty...
Hope some of that helps...