This chapter is a reference to a game show, for which unfortunately I can't find any footage at all. The title of the show is a pun on its own: it could also be read something like “Let's make firm evaluations/purchases!”, with the “let's” being pronounced like the English word “Show”.
There's a song mentioned in an author's comment: it's a well-known jingle from a commercial for a Sanyo Zubacon color television (with a remote!) that aired sometime around 1971-75. Unfortunately, I haven't been able to find a recording of the specific commercial, but there are quite a few Japanese netizens who remember it from their youth and have mentioned it in blogs and on message boards.