(Undated) — Americans are losing roughly 15-billion dollars in unused gift cards, vouchers, or store credits. Ted Rossman from Bankrate.com says Californians have the best options to get their money back. Almost three-quarters of those with unused credits have had them for more than a year. Rossman recommends using gift cards as soon as possible or using them as gift. There are also websites that will buy gift cards. Bankrate.com’s Ted Rossman says one generation is affected more than others.