The Sacramento Kings' season ticket sales have already surpassed last year's total, team officials said this week, thanks to NBA marketing assistance and a newfound ardor among fans after the team nearly left town this spring.

But that bonanza could slow, starting Friday.

The NBA's collective bargaining agreement expires at midnight Thursday. If the league and players don't come to a new agreement by then, a lockout may ensue, and with it the possibility that the upcoming season will be shortened or canceled entirely.

"In the unfortunate event that games are missed next season, all NBA season ticket holders have the opportunity to receive a refund of the purchase price, plus interest, for all missed games," NBA spokesman Mike Bass said.