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Yes there is, but I would rather learn Judo or BJJ.

True. The MMA place, their system is a mix of Kickboxing, Boxing, Muay thai, San Shou, Wrestling, BJJ, Jujutsu, and Sombo.

But I would rather learn the stand alone system of Judo or BJJ.

All I gotta say is this. I have a friend who's a black belt in judo, a head taller and twice my mass. Once, he said my karate wasn't s**t. What? did my friend honestly expect me to hit him? He's my friend! So I'm screwing around, and he slams my a** hard into the pavement. I dust myself off, and he goes blabbing "BLACKBELT JUDO (to himself) BROWN BELT KARATE (to me)" (and repeat). Ok, round 2? I caught that b*****d taking me down with a different throw and all I remember is throwing my arm around his neck and guillotining him. He taps out, and I go "huuurrrr hurrr hurrr! WHITE BELT JIUJITSU! (me) BLACK BELT JUDO (he)!" (then again, despite the fact that I've been doing BJJ for a good while now, I don't really see myself as a BJJ stylist or even ranking...)

...I'm just gonna go and say BJJ because there's more emphasis on submissions. But At the same time, you've got some submission wrestling experience, so learning some judo wouldn't hurt.