Jon Gosselin -- Scratch That Bowling Alley Noise ... I'm Gettin $20k To DJ

One of the 3 people who caught Jon Gosselin DJing at a New Jersey bowling alley last month were lucky ... because he just got offered a $20k gig in Atlantic City.

According to our club sources, Jon's spinning his way up the ladder fast ... he's moved on from Brewster's Bar and Grill to drop the beats at the posh Pool After Dark club in Harrah's Casino.

And he won't have to spend 5 hours around pins and funky shoes ... he'll only spin for an hour before spending another hour or so meeting his loyal fans.

The money's definitely good but it barely dents the $1 mil judgment against him in February for stealing from a former boss.

Too bad he can't spin that.