The LEGO Friends Advent Calendar is going to be available in United States and Canada very soon. However, it will have very limited stock and availability compared to other countries in Europe.
Forum member meyerc13 reports that his LEGO Brand Store manager in Wauwatosa, Wisconsin told him that the 3316 Friends Advent Calendars will be arriving this week in LEGO Brand retail stores. However, they will only getting one shipment and it will not be available elsewhere including the online LEGO Shop at Home site.
Therefore, if you want to secure one of these Holiday Advent Calendars, you should keep an eye at your LEGO Store.
LEGO Friends Advent Calendar 3316