It makes no sense to spend any serious amount of time saving money on razor blades -- at total cost of ownership per year in the $100~200 range, the thing to ma

It makes no sense to spend any serious amount of time saving money on razor blades -- at total cost of ownership per year in the $100~200 range, the thing to maximize for is comfort and safety. If you get your blades for free but have a small chance of cutting yourself / someone else when you dispose of them, that's a terrible tradeoff.