Buy $30 or more of select Procter & Gamble items and get a $10 gift card via this mail-in rebate. It's the only such free gift card offer we've seen from P&G. You must buy at least two items and reach $30 or more to qualify for this offer. Eligible products include Metamucil, align probiotic, Prilosec OTC, and Pepto Bismol. Deal ends July 31.