Your question is valid and many beginners fell in the trap of buying coins because they were thinking they were "cheap".
In fact there is a catch here. It is the total supply of the tokens. Multiply this number with the current price and you will get a number that informs you of the current market cap of this token, which you can consider the current valuation of this coin (just as the valuation of a company).
Now try and make sense with these numbers. Is for example the coin ICON correctly valuated at 100m USD today? To answer it you have to ask more questions as: Does it have a working product? How many people use it? Are the developers creating anything new? Has it solved the problem it claims to be solving after 3-4 years of activity? (ICON was an example here, I have no idea what it does to be honest).
It is hard to figure if a coin is expensive or cheap. Marketing is making this process harder and usually inflates prices. I usually try to look into projects that use less promotion and try to figure out if they have any decent chance. Most of them have another 95% to lose from their current price.