SANTA FE, NM—Before a spellbound audience consisting of his wife, his two daughters, and the family cat, area dad Larry Schroeder described in gripping detail Tuesday how he just barely managed to save $4.27 at the local Wal-Mart. "So I'm sitting in the car, literally turning the key in the ignition, when it hits me," said Schroeder, pausing briefly for effect. "They charged me for the free teeth-whitening stuff, even though I bought three tubes of Crest like the coupon said. Thank God I remembered to keep the receipt." At press time, Schroeder had further awed family members by producing the very receipt from his wallet and pointing to where the manager had initialed to authorize the refund.