If you go here, you can print off a coupon for a Free Orange N' Creme Frutista Freeze at Taco Bell. This is limited to the first 500,000 people who actually redeem this coupon at Taco Bell. It may allow more than 500,000 to be printed, but then they won't accept them at Taco Bell after the max number. It says that they will post on the Taco Bell Website when they have reached the 500,000 redemptions. This coupon is valid until 11/25/10 if they have not reached their redemption limit by that time. This does not require an additional purchase.
*Don't forget about the Free Limeade Sparkler Coupon in the 10-17 Redplum as well! There are several different coupons for Taco Bell on the front page- one does not require a purchase to receive the Limeade Sparkler for free!