JayJays have had two comic-book Transformers t-shirts for a little while now, and it looks like they are on clearance.
Usually $25 each, you can get the pair for just $15 (from $50), or $10 each.

Issue 2 t-shirt on white

Issue 4 t-shirt on black


And for something slightly Transformers related, is a Minion t-shirt with "More than Meets the Eye" on it.
If only Hasbro had that phrase trademarked...