I would like to know if there is any way to edit in bulk, either with an excel file or a flat file separated by commas, or a google spreadsheet, the price of the products (using the product field) in my form. Do not use WooCommerce
I have 40 products each with a different price that will change every day.
It sounds like you could use dynamic population to pull those product prices from a data source. Have you looked at Populate Anything from Gravity Wiz?
With that plugin you can populate directly from a database table. If you used that table to store your products and prices, I think that plugin will enable you to keep your form up to date with the latest information from that table.