Help! Transitioning formulas, which one is best?

Michelle🤱🏻💆🏻‍♀️ • God & family! ☝🏼 👪 Baby born 10.25.18 🥳👶🏼

Our baby has been on Alimentum ready to feed for almost 7mo now and after going to an allergist he’s approved him coming off of it as he no longer has any allergies but I’m so lost on what to get.

After spending almost 11$ a day on this formula we want to still give him a great formula but if possible more cost efficient. Any recommendations are appreciated! 🙏🏼