Q: Do I need an international stamp? Can I just use $1 worth of normal stamps? How long will it take to the post office to leave IL and get to Madagascar?
A: Depends on how heavy the envelope you are sending is and how long you want it to get to the destination. This website should help. http://ircalc.usps.gov/default.aspx?Mode=Intl_Single&CID=10253