Comment by jperkin

They're all available:

    $ pkgin se python3
    python35-3.5.1nb2    Interpreted, interactive, object-oriented programming language
    python34-3.4.4       Interpreted, interactive, object-oriented programming language
    python33-3.3.6nb3    Interpreted, interactive, object-oriented programming language

along with a bunch of pre-packaged modules:

    $ pkgin avail | grep ^py3 | wc -l
        1412

Let me know if anything you need is missing and I'll add it.