its not too cold to ship.
i shipped out e. belem a week ago, and got no complaints about it being frozen.
you just gotta use a good bit of insulation (newspaper) and thats it. the boxes spend most of their time next to people, which means the temp will be above freezing for the persons sake.
In that case, if anyone has a handful of floaters they are willing to part with, Hit me up! That's a good point about above freezing for the mail lady's sake!