Coupons.com has a $1/2 coupon for Taco Bell Products right now. I would hurry and print though before it disappears. Print limit is 2 per computer.
These are current prices at my local Wal-Mart (Wal-Mart prices tend to vary between regions and stores):
Taco Seasoning-$0.50 = 2 FREE with coupon
Taco Shells- $1.00 = $0.50 each wyb 2
Taco sauce- $0.98 = $0.48 each wyb 2