Blood-flavoured lollipops are sold in the "Unusual Tastes" section of Honeydukes in Hogsmeade. They are possibly sold in other wizarding places as well. It is unclear if they are appealing to anyone other than vampires, or perhaps are meant to be used to play a trick on others. On their second trip to Hogsmeade in 1993, Ron and Hermione discussed whether or not to purchase some for Harry. As it turned out, Harry was standing right behind them at the time, having used the Marauder's Map to sneak through a secret passage from Hogwarts to Honeydukes.