Formula recommendation

Hi mommas. I have started to wean my son from my breast milk and am wanting to give him more formula. But I notice he can go through at least 2 cans of formula each month (about 1530 grams powder). The stage 1 enfamil were cheap at Costco. But now his ready for stage 2 and found everywhere is comparable but expensive for the A+ one. The stage 1, I spent $60 each month for him. The stage 2, I am looking at $80 a month. Is there a huge difference between enfamil 2 and enfamil 2A+ besides the dha in the 2A+? Is there other powder formula that works the same way as enfamil 2A+? To clarify these are same brand but different products. One is regular enfamil 2 and the other is enfamil 2 A+ ****hence the A+. And it’s the stage 2 from 6 months to 18 months. Is there another product you have tried similar to enfamil 2A+? Thank you very much mommas!!!!