100% a mistake. They probably meant to put the 1st gen model for $120, to match/beat Costco's price. If I'm not mistaken I read somewhere that authorized apple resellers aren't suppose to sell older models of accessories when a new one comes out, hence why all retailers tried to get rid of apple watches/airpods as new ones were rumored to come out.

I really do hope that they do NOT cancel, but having ordered from Walmart for many other things(Sometimes they also "oversell"), they most likely will if this gains too much traction. Nonetheless, thanks for the heads up! I would not have ordered AirPods otherwise as I wanted to see what Beats were going to bring to the table first, but at this price point, it can at least be a good gift.