Available at Emerald City Comic Con 2017 and C2E2 - Chicago Comic & Entertainment Expo.
This issue is a variant of Super Sons (DC, 2017 series) #1.
There exist further variants:
Superboy [Jon Kent]; Robin [Damian Wayne]; Alfred Pennyworth; Batman; Clark Kent; Lois Lane; Kathy Branden; Lex Luthor (cameo); Super-Duffys [Reggie Duffy; Mom Duffy; Dad Duffy; Archie Duffy; Sara Duffy] (flashback)
Synopsis
Robin is investigating criminal activity aimed at Lexcorp and enlists Superboy's help, but they're just getting started when they are confronted by Luthor himself.