You can now set a max quantity for each Simple/Multiple pricing option to limit how many of each option can be sold. Any number is valid, including zero "0", which means the price is always sold out. If the max qty field is left empty, no maximum is set, which means the price will never be sold out.

You can see that the Shared Accommodations are limited to 5. 

Once those 5 are booked, it will show as sold out

This feature has been added for all centers on all plans.