I've recently made a new batch of SketchCrawl t-shirts in a nice "galaxy blue". They are American Apparel, their "sustainable edition", made of organic cotton. You can purchase them for $20 here.
I ship all over the world.
You can also if you're interested purchase a t-shirt and my book Venice Chronicles as a combo at a discount here: http://enricocasarosa.com/wordpress.1/atelier-fio-bookstore/.
Thanks for helping the SketchCrawl cause, the money we raise with t-shirts help us fund this website !
Keep in mind when choosing a size that these shirts shrink in the first couple of washes, and especially for women they run a bit small.