It takes about 3 weeks for T-shirts to be processed and shipped out.
If you purchase the official MTI Logo T-shirts you can sell them for a profit at your show or even as a fund raiser. If you choose to make your own shirts they may not be sold for a profit.
You may make your own T-shirts using your logo pack but they can only be sold to cast and crew at cost. You can not sell them for a profit.