I've been shaving with double edge razors for decades. I just shave "dry" after I get out of the shower. I have never once used any of those other products. My blades each last a few months (I shave 1-2 times a week), so a package of 100 lasts me... in theory, 25 or so years. Which sounds about right, as I bought a package a decade or so ago and am starting to get towards halfway through.

Shaving can be very simple and cheap.