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You can achieve this using the Coupon Code in the Order form.
You can check here a similar discussion
Hope this help. Let us know if you need further assistance.
This isn't going to work for me because my products is highly customized and already listed in the form. Can you please submit a feature request to have the Form Calculation widget integrated with the capability to apply conditions? i.e. that it be less than, equal to, or greater than a certain value. Let me know if that makes sense.
You can indeed use conditions with the calculation tool to validate if the order total is below $35. I mean you can create a condition like below in order to hide the Submit button of your form and show a message that will let your customers know that you request a minimum purchase amount of $35 to submit the order.
Is this what you're looking for? I created a cloned version of your form here: http://form.jotformpro.com/form/51477800290959 that you can review and let us know if this would be a feasible solution for you.
If it is, feel free to clone the form to your account. If not, please let us know how exactly you want this validation to work so we can better understand what you're trying to accomplish.