Archie’s Sonic The Hedgehog #137 is on sale in comic shops starting today. The following back issues might also be found in select comic shops: Sonic’s Friendly Nemesis Knuckles #1-3 (the original Knuckles mini-series), Knuckles: The Dark Legion #1-3 (the second Knuckles mini-series), Knuckles The Echidna #4, and Knuckles The Echidna #5.
Source: Diamond Comics