This actually happened to be way back when I bought the Moto 720...and within 20 days, the price was $50 after rebate when I paid originally $100 after rebate. I went into the store and they credited my card back $50 bucks. Just go in and ask...can't hurt. If it's within 15 days, then definitely you'll get your cash back. If it's been under 30, I bet your chances are still good.