No-hassle/come when you can Pilates/workout studios?

I recently quit my public gym membership in search of something different. I’m looking for a Pilates studio or other workout type studio that I can buy a couple of classes and use them whenever I can. I don’t want to feel obligated to purchase a membership type of plan because my schedule always changes and I don’t know when I’m available, so it may go to waste. I’ve heard of Class Pass and I’ve used it a few times but wonder if there’s any other options. Are there any studios anyone can recommend in Houston that offer the flexibility I’m looking for?