I'm a sucker for game related stuff. Shirts, jackets, cups, hats, etc... I don't buy much, but I love that it exists. With the newest Portal 2 merch, however, I may make a purchase. Just added to the store are three shirts and two glass water bottles. I really bad want a water bottle to go with my Aperture Pint Glass.
The shirts are, well, they're shirts, but those bottles! All three shirts can be had for $19.99 while the bottles are available for a reduced price of $14.95.