Fitness / self defense classes

I just tried a trial run of krav maga on Northlake and fell in love. I normally just go to the gym and hit weights, but my motivation wavers and I'm not always consistent, and it's more enjoyable with a workout partner. I've never done any workout in a group setting before now, but I can really see myself getting into this. Which group fitness or self defense classes in the area do you participate in? And how much do you pay for your membership?