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Lookin' for some insane courtside seats to the Lakers game?

Jack Nicholson tells TMZ Sports he's willing to sell you his for face value ... since he's not as motivated to go the Staples Center as he used to be.

It's actually pretty sad ... Nicholson -- who's been a staple at the Lakers games for decades -- was leaving Madeo in Beverly Hills when he told us he's just not as into the Lake Show as he used to be.

We're guessing the team's abysmal record has a lot to do with it.