I can't find any comparable products to check for price consistency?

So you are trying to find out whether there is price consistency within a niche, but you cannot find websites selling the same products.

This may be a sign that there are not many competitors within that niche. After searching for several products within the niche to no avail, you can leave that cell blank while you work through the rest of the worksheet.

Then, if either of that niche gets through as a finalist, you will learn how to find if there are direct competitors. If there are the minimum of 3 direct competitors within that niche, you should be able to directly compare prices across your competitors to find out whether there is price consistency!