The impressive spread at the Silverton was already one of the best deals in town, with plenty of well-executed midscale offerings. Now the buffet is an even better value. Through the end of the month, members of the Discovery Club — signup is free — can receive two buffets for the price of one. If you’re fortunate enough to go on a day when the buffet includes Asian walnut shrimp, don’t pass it up. For more information, visit the hotel’s dining site.