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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At the moment we don't have a provision for searching a product,.
However if you anticipate a small number of products or where a user can select only one product you can user the auto complete widget in combination with conditional logic to show the price for product based on what the user types.
You can then use a form calculation widget to get the total and pass it to pay-pal as a price value
If you need further information and clarification, feel free to contact us