Gift card sales at Aubree’s Saloon and Cady’s Grill in Ypsilanti’s Depot Town are big sellers during the holidays, said owner Sandee French. “I keep a couple hundred around this time of year. We go through them relatively quickly.” She switched from paper gift certificates to plastic cards with a magnetic strip three years ago. They’re easier to track and harder to lose. And it’s a way to get her restaurants’ logos out in the community.