Rock paper scissors.
write 1, 5, 10 +/- on the board. Use some sentences from the unit and have as many teams as you want. Get students to complete a sentence, make a dialogue, spell, anything and then bet their points. They play RPS against you or the opposing team.
Teams start with zero, so if the team wants to try for 5 points and they win, they get 5 points, they lose, -5, etc.
Low tech!