Kickboxing gym that allows drop-ins

I’m looking to add a kickboxing workout to my weekly routine. Mainly for fitness, I have no interest (or ability) in being the next UFC champ. Maybe some light sparring with level headed partners. Im only wanting something that is once a week, and I figure a drop in fee would make it more worthwhile. I used to train at Kru Pong’s on Westheimer but that was a few years and a few orthopedic injuries ago. Anyone have any suggestions? Preferably south of I-10. Thanks!