Hey @BenFisherArt ,
based on information you shared, I assume that the easiest way how to solve this is to create a new product page template, hide the price, buttons such as add to cart and purchase, and add a button for contacting you (this will redirect customers to contact page), or add a contact form.
You can also add additional information for these “custom products” – such as that the prices range from X to Y so that the customers have at least some kind of information about the prices.
If there are lots of variability, it’s hard to say whether you would achieve the desired “scenario” with the apps. You can of course give them a try but if you’re looking for the easiest and quick solution, I think that the new product page template can be the best one.
Let me know if you have more questions!