Mailing/giving stuff to your alts?

[Rilifane]

1. FC and transfer stuff via FC Chest
2. pester your friends to transfer stuff
3. put it on the MB, log on your alt and buy it. You can either put it for a price that's slightly above average so others don't snatch it away but there's always tax loss or you put it up for 1gil, have no tax loss but need to be really fast so nobody snatches it away. Best to do the latter late at night when few people are online.

That's pretty much the only options you have and all three are a pain in the butt.
If you want to join a FC with your main but not your alt, option 1 is out of question and you likely won't always have friends available for transer.