The cheapest Chevy from 2010 I can find is the 2010 Aveo LS at $11,965. My only guess is that it was some 2010 model that had been sitting for 10+ months and they needed to get them off the lot.
Even with this, a new Aveo for $12k in 2010 would now be ~$17k with inflation. New cars today seem to be around $17k and that includes the Versa and the Mirage. Of course wages haven't risen with inflation but that's another can of worms.
To be fair, I don’t think they’d have gotten a single one for $5k or less, and only got that price by buying the pair, and I think the new model years were about to arrive or just had. But they were new cars!
Iirc the cheapest new car in the US market then was the Versa. And it was not $5k.