The initial investment in going to an old-school shaving setup is about $100. Safety razor, some blades, badger-hair brush and saving soap. But the payoff is huge over time. A $5.00 bar of shaving soap can last 6 or 8 months with daily use. High-quality DE blades are $0.50-$0.80 ea, depending on quantity.
As the article states, it takes a little more time and finesse to get a full shave done, and I like that. It's been, for me, an enjoyable way to start the day with a routine that requires some craftsmanship and skill.