Are seniors cheaper? Not when it comes to grandchildren. But in just about every other category we love a good deal. One of the latest to pop up is a variation on those restaurant coupon books that used to jam our mailboxes. The latest, unsurprisingly, is on the internet and is called Blackboard Eats. You can save 30% on some pretty reputable restaurants like 54 Mint, Poggio, Aperto and SR24. But you have to move fast. When you’re alerted to a deal, you’re given a passcode and 24 hours to reserve. Be sure to check expiration dates.