We really wanted to make a shirt again this year (provided the monkey laser cut looks as cool in real life as it looks in my head).
Unfortunately, after doing the math, we found that printing the shirt in Japan really wouldn't be feasible a second time. At least not as far as we've been able to explore.
We've been looking for a good t-shirt printer in the US, but so far haven't found the right situation. Worse comes to worst, we might try to go with an online shop like Design By Humans - I've got one of their shirts and love the quality - especially the softness of the Direct-to-Garment printing. Of course, the best case scenario would be to find an independent printer who could help us out for a cost that makes sense (including shipping any leftover shirts back to Japan).
One thought we had was to do the tees as a separate Kickstarter project. It's really up in the air right now, though. If you know of a really good t-shirt printer, please let me know. If not, I'll keep on hunting.