I usually take GU's, but this PowerBar gel had such great pricing that I just felt I had to mention it.
Buy 2 (24 pack each) or more, get 50% off. Mix or match. (2 boxes @ $24.47 for both; $12.23 thereafter.)
For the Special, go here: PowerBar Gel Special at the Running Warehouse
Updated: Offer valid through October 31, 2010.