http://techart.spreadshirt.com/
If you were at GDC last year and/or this year, you’re entitled to a free shirt. Please PM me if you’d like to redeem. I can’t guarantee I’ll order it right away but it shouldn’t take too long (I’ll probably wait a week or two and order them in a batch). Also, if you were one of the contest winners, you are owed a shirt as well. You may notice some slight changes from your original designs, since I had to recreate them.
The store offers American Apparel (AA) shirts, and Standardweight shirts. The AA are what I vastly prefer, but the Standardweights are of good quality too, and much cheaper. No grey, though.
If you have a logo or design you want to submit, or you’d like to offer an improvement/color choice/new type of item, please post it! Also, if there are any quality problems, please PM or respond here. I did my best to QA things.
I should also be setting up a PayPal soon to accept donations, for all those people who have asked.