How to find popular and conventional electronic parts?
I think you are concerned about availability in case you want to mass replicate your project. Availability is strongly dependent on geographic location. A component may be easy to obtain at a downtown store, but not in "rural" areas, and so you would have to make mail orders, right?. A hint would be visiting the online parts catalog of a couple local stores (and make sure they are listed because they are in normal stock, not because they COULD be ordered).
I once wanted to build a PLL synthesizer. 1st thing I did before drafting the design was asking my local store what models they were already bringing because some manufacturer was already purchasing them.