If you want a phone call, consider a scheduler (feature of some CRM's) or an 3rd party widget. It looks more professional, impacts value on YOUR time and makes it easy for the prospect.
I recommend, NOT offering this for products or services below a price point you determine. Do you want to spend X number of hours to possibly sell products under a given price point? Use a video and/or FAQ's to address.
Also you can have a form or chat-bot address a question using the price-point question to help you determine how much time & energy to invest.