Lamar Odom's Dallas Mavericks jersey is barely worth the fabric it's printed on -- at least according to the team's flagship merch store, which is dumping all Odom gear ... for dirt cheap.

Distributors for the Dallas Mavericks Ultimate Fan Shop tell TMZ, the moment Lamar's exit was announced they busted out clearance signs ... and slashed prices in an effort to unload every last remnant of #7(ironic) merchandise.

As you can see by our photo-enhancing skills -- the jerseys originally sold for $110 dollars a pop, but then dropped to $89.99. Now, the jerseys are going for a paltry $44.99. All other Odom merchandise was similarly marked down.

But it's not exactly helping sales -- we're told the store has only hocked TWO of the jerseys collector's items since cutting prices.