The Nets have extended their free gas promotion. They say it's won them 200 season tickets. Season ticket-holders get 10% of the ticket costs back in the form of gas cards. It's one of several promotions the Nets and other pro sports teams are trying as the economy weakens. And the Nets now have the NBA's fifth highest average ticket price ($60.98), behind the Lakers, Knicks, Celtics, and Bulls.