Ahhh....behind all the flowery "DC Comics Club" and "Charter Membership" hoo-ha, it's really just a subscription pitch. And those "brand new DC Specials" are no doubt just reprint collections, like Super-Heroes Vs. Super-Gorillas and the like.
But wait...there's something different here...
Yup, rather than pitching subscriptions to single titles, DC was trying to make readers subscribe to three titles at a time, in preset groups. In each of these first three sets, you got 12 issues of each title + the 4 DC Specials for 9 bucks:
Show your work...