Threadless are having a special sale today - all tees $9 to celebrate 09/09/09! For those with a penchant for Threadless shirts, now's the time to grab those designs you've been umming-and-aahing about!
Of course postage is extra. And be careful - if ordering a whole load at once you can get stung for import duty. Better sometimes to split up your order to avoid this.
EDIT: consensus seems to be that ordering no more than 3 shirts at a time should keep you under the customs limit for import vat - thanks bunkum100 for the link.