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JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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For now we don't have this inventory feature. A workaround might be using the submissions counter feature:
You need to limit the amount of submissions of the form:
This will count submissions, not tickets, so to be more efective you should only sell one ticket per submission. But if you do this then the unique question from the previous thread won't work.
It's not a perfect system, but I believe balance can be achieved.
Let us know if further support is needed.