Here is my Classpass link to join:
https://classpass.com/refer/BJVKM28F4
Everyone who joins gets a free 20 credits for 14 days but if you use my link, you get an extra 20 credits which means you can try more classes. I get 20 credits too.
I love Classpass, it's been great so far for trying out different fitness studios without having to sign up to each one.
As a rough guide, I've found that mat pilates classes are around 7-9 credits with reformer classes being more expensive at 11-14 credits. Yoga classes can be a bit cheaper at 3-5 credits. There are lots of other classes too.
When you first join, there tends to be discounts on the classes so your free credits go a bit further.