Help buying Note 2

Which retail stores sell the factory unlocked Note 2?

If the only option for the factory unlocked model is online and therefore I have to get a carrier unlocked model because I don't want to wait, is there anything I should know? Will I be able to use any carrier unlocked model on any carrier or MVNO? Is there a specific carrier unlocked model to avoid (least development community support, ridiculous verizon logo, laggy software that can't be disabled, or other problems)?