Toys R Us must have been that kid in school that always had to be first in the lunch line. TRU online has Series 5 of the ever-popular Collectible Minifigures available for pre-order with free shipping. Estimated ship date is August 18th.
You can't guarantee you'll get a full set, but surprisingly they are not marked up. They are $2.99 each... for now. If you absolutely have to have them, this might be the fastest way.
Originally found by Lego_noob and posted on the LEGO Shopping Worldwide Flickr group.