JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
We believe that if one user has a question, there could be more users who may have the same question. This is why many of our support forum threads are public and available to be searched and viewed. If you’d like help immediately, feel free to search for a similar question, or submit your question or concern.
Yes it is possible to achieve your requirement. You may like to take a look at our "Ticket Purchases" widget and see if that fits into your requirement. This will allow you set how many tickets you want to sell and once that many tickets are sold, user will not be allowed to select the ticket.
Do try it out and get back to us if you have any questions.