Our son is on the Similac Neosure right now but we are slowly switching him over to Enfamil Enfacare because we are getting many more coupons and deals on it than the Similac. (Our ped. ok'd the switch). Now I hear that there is a Parent's Choice (Walmart) brand 22 cal preemie formula. It is 10.00 a can plus I guess you can get one free can a month and there are occasional coupons. I am still out on maternity leave and my hubby just got laid off so money is TIGHT. Anyone have experience using the Walmart brand? Isn't formula pretty tightly regulated that the differences shouldn't be very big?