How can I limit the number of people who can sign up for an available time?

How can I limit the number of people who can sign up for an available time? Also show how many more are available?

We do not currently have a product limit option implemented in our payment tools, but there is a work around available which is based on the Inventory widget.

Please check the 'Implementing stock limit option b.' section of the following article.

Mastering Payment Form Integrations with JotForm

There is also a quick screencast:

http://screencast.com/t/wvBMKrTNZKCy

If you need any further assistance, please let us know.