You could still use the beach theme that way you would have lots of ideas already put together for you. Otherwise how about drawing attention to the whole idea of getting "two things for one price"? Kind of like: You get pairs of socks and pairs of shoes, pants come with 2 legs and shirts with 2 sleeves, you've got 2 eyes so why not get two books?! Or how about the Doublemint theme? Double your pleasure, double your fun, shop our fair and get 2 for 1!! You could give out packs of gum with the flyers.
Our buy 1 get 1 free Schoolastic bookfair is next week and I am asking for help in ways to promote it!! I attended the Book Fair Workshop for the first time and found out about all the help that Schoolastic gives and we have'nt been using. The theme this spring for Schoolastic is "Book Fair Beach" however for the BOGO they do not have a theme. If anyone has any ideas please let me know!