Hey, how come there's no introductory Go-Go Checks House Ad for our seventh day? Well, because as far as I can see, there isn't one. I can only find six general Go-Go Checks Ads. So, it looks like DC was fully behind this initiative. (Kids love the Go-Go Checks!)
Anyway, here's one more title-specific Go-Go House Ad!
Go-Go Checks house ad for Doom Patrol #110 (March 1967) and Challengers of the Unknown #55 (April-May 1967), printed in Metamorpho #11 (March-April 1967)
Comic cover art: Doom Patrol #110: pencils and inks by Bruno Premiani, letters by Ira Schnapp
Challengers of the Unknown #55: pencils and inks by Bob Brown, letters by Ira Schnapp
Ads designed and lettered by Ira Schnapp
Go-Go Checks designed by Irwin Donenfeld and Sol Harrison