There are several pros and cons for money orders versus cashier's checks that may be worth your consideration:
Pros and cons of a money order
A money order is a great option when you need to make smaller purchases. Because it is a smaller amount, it is often cheaper than the cost of a cashier's check and usually does not require a new account.
Just be sure that you can keep the total amount under $1,000 and account for any fees you may encounter. You also want to keep track of the transaction, safely storing the receipt until everything is completed because it is otherwise untraceable.
Pros and cons of a cashier's check
A cashier's check may require opening a new banking account; a money order may be your best bet because there are rarely new account requirements.