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May I know what checks for payment method you are referring to? Were you referring to eChecks or the traditional check? If it is a traditional check, then you would just need to instruct your users to where to write the check I believe.
You can use the "Purchase Order" payment field so that you can still have the features of a product/payment field but it is not integrated on any 3rd party payment processor.
You can check the list of payment integrations that we support on this link: https://www.jotform.com/help/323-Mastering-Payment-Form-Integrations-with-JotForm. However, I believe we do not have any support or integration with regarding to eChecks.
Let us know if you need more help on this.