Or, HURRRR. I totally should mention that my avatar is a Lion King (broadway) logo on a tank top that I made specifically for the show. If you're a creative person, you can make the shirts yourself using a stencil, a printout of your design, lots of tape (to tape stencil to shirt) and paints.
I used a new black tank top from Old Navy, acrylic paints (I have on hand, because Im an artist and have.. err. Let's not count how much paint I'll confess to owning) and sponge brushes to apply and layer the paint.
The shirt has washed very nicely- at first it was stiff from the paint, but after one washing it was softer. Now, after about a half dozen washes, it's just as soft as any other shirt and hasn't faded or chipped or anything.
There's a few more photos here-
http://forums.wdwmagic.com/threads/lion-king-on-broadway-pittsburgh-omg.863791/page-2 if you're interested. It took maybe 5 hours total, and this shirt will last a long time.
I can't believe I didn't even think of this the first time I posted on this thread. Haha! I feel like an idiot.