T3 used to be pretty easy to get legally from a well known source though he doesn't carry it anymore. However you can get a liquid T3 version, that is a bit more difficult to dose, but should work just as good. If mods say its ok I'll post a link to the site, but it's very similar to the Pump and Pose products that are simply suspended in liquid and then sold as "research only".
I haven't tried it yet but since I'm running low on my T3 pills I'll probably invest in some and see how it goes.