Passing inventory item selection to payment tool

I am having a heck of a time with the logic involved with my inventory form. 

I have a limited amount of inventory and don't want a person to choose that item, when the inventory is gone.

Anyone willing to hop on my form to help me out?

We do not have a built-in stock limit option, but as a workaround this is possible to use a combination of Inventory, Form Calculation widgets and one of available payment tools. The idea is to calculate a Total amount and forward it to the payment field:

How to pass a calculation to a payment field

Please see the next video:

http://www.screencast.com/t/n0DbdinnfDbq

If you have multiple products just sum them in calculation widget.

Result:

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

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