UPDATE - December 20th, 2016 - 9:30pm
GameStop has released additional details, clarifying its plans to offer the NES Classic Edition this week. Units of the gaming system are currently rolling out to GameStop stores, Jackie Smith, manager of Corporate Communications at the company said via email.
"NES Classics are arriving in stores now and will be available for purchase upon arrival," Smith said. "Some stores received units yesterday, some today, some will tomorrow, some will Thursday. Stores will NOT use the sign availability method on this round. The units will be available as they arrive and on a first-come, first-served basis. Again, this is a VERY limited number. And this is the last batch before Hanukkah/Christmas."