Formula Milk (6months L.O.)

Good day!!! My L.O po is 6months already. S26 Pink po sha pero gusto po sana magpalit ng Formula Milk dahil medyo pricey na sha at malakas na sha dumedede. Any idea po sana kung ano top 3 formula milk na medjo makakatipid ng slight. Salamat#advicepls #pregnancy #firstbaby