Currently, serveral milk powder companies have promotion e.g. buy one get one free. Simply call them and you will get the offer. Some of them have free trial (400g) + toys.
The injection for 1.5 BB always follows with fever.
Just give BB more liquid to drink (not only water as too much water will cause 中水毒 --- Lost of potassium), less cloth and good ventilation. Bath BB with warm water and if fever goes up to 40 C, give BB medicine.
Don't worry. It is the lesson that every mother and BB must pass through.
Good luck and take it easy.