Integrate multiple submissions into a single form

I have a form where people enter the name of an item and its current market price. This then populates a table that I use to do further market analysis. The problem is that people may have to submit this form up to 50 times in a single sitting and having to submit, click to reset the form, and submit again is really tedious. Is there a way I can just have them add multiple “rows” to a form and submit all of their data at once? This seems like an obvious feature to me but I don’t see any way to do it.