Yes, we do ship to Brazil.
When we ship, do list the value of the items on the customs declaration form that is part of the shipping label. We ship DDU (Deliver Duties Unpaid). This means you will be responsible for paying any import related fees when your package arrives. This includes brokerage fees, duties, GST, VAT, or other import related fees and taxes. We cannot tell you what these fees will be. I recommend you contact your local post office to find out what fees you may have to pay.
For shipping to Brazil we do need your tax ID number (CPF for CNPJ) to include on the shipping label. Without it the package may be subject to return or disposal by Brazilian customs.
Unfortunately we don't know how long Air Mail will take to deliver. It can be anywhere from a couple of weeks to many weeks.