Can I include a zero price when enabling special pricing for a product using the payment wizard?

I am working on new online membership form for a non-profit. I would like to include a "product" which indicates whether dues have already been paid or will be included when the form is submitted. The form below demonstrates what I am trying to do. This does exactly what I want but only if I specify a non-zero value for the "already paid" option. When I input a zero, it is not being stored. Is there a way to do this?

I have also tried to use two different payment forms that are displayed/hidden based on a radio button but I'm not allowed to use two payment forms on the same form.  I also tried the multiple options feature but it only works on a single product and I have multiple products.  My only other alternative that I can think of is to have two different "products" and just hope that the user chooses one or the other (or have two different forms which I really hoped to avoid).

Any help that you can provide will be appreciated. 

Hello tfsforms,

If I understand your requirement correctly, you want your users to select "Already Paid" or "Dues Included". Is that correct?

Unfortunately, it is not possible to have a special pricing set to zero. It should always be greater than zero.

I would suggest you to manage this requirement with normal form fields and then pass the calculated value to your payment question. Please take a look at the following cloned form and see if this is an acceptable solution :  ***DELETED*** Feel free to clone this form for a closer look. The following guide should help you in form cloning:  http://www.jotform.com/help/42-How-to-Clone-an-Existing-Form-from-a-URL 

Do get back to us if this solution looks okay to you and we will a step by step guide to achieve this.

We will wait fro your response.

Thank you!

Thank you very much. This solution works perfectly for me. I have already incorporated your solution into the real form that I was preparing. Since I may have included real account information in the form that you cloned to demonstrate your solution, could either replace that information or delete the form http://form.jotformpro.com/form/43131857432957? for me, please?

Thanks again for your help with this!

On behalf of my colleague whom was helping you here you are most welcome.

And additionally yes, I'll inform him and we will make sure the other information is removed|deleted from the mentioned jotform per your request.