These are the old-fashioned type. You buy the sturdy handle (usually metal), and replace only the thin metal razor blade. Until around 1970, this was the only kind of home-use razor you could buy (unless you shaved with a straight "cutthroat" razor, like a barber with a leather strop, but most men didn't take it that far). You can still get an excellent safety razor for $35 or less, and good replacement blades for about 33 cents each. Expect each blade to last for about five shaves, according to shaving expert Mark Herro at Sharpologist.com. Over 10 years of daily shaving, that works out to $255, or about 7 cents per shave.Cartridge Razors
Most men use cartridge razors nowadays. You buy the handle (usually plastic), and when the blades get dull, you replace the whole razor head (aka cartridge). Fanned out in the plastic cartridge are at least two, and up to six metal blades -- one (or five) to lift the whisker, and one to actually cut it -- plus a lubricating strip or two. You'll pay about $9 to $13 for the handle, and $2 to $4 each for the cartridges at the drugstore. Internet shaving clubs sell them for less. Expect each cartridge to last for about 14 shaves, Herro says. Over 10 years, you're looking at $800, or 22 cents per daily shave (assuming the plastic handle doesn't break).Disposable Razors
A disposable razors is similar to a cartridge razor, but you throw the whole razor away when the blades dull. You can buy single-blade disposables for as little as 25 cents each, but our Best Reviewed disposable razor costs around $7 for a three-pack. Disposables dull after about four shaves, Herro says, so that works out to around 67 cents per shave -- or more than $2,400 over 10 years. That means that if you're traveling and forget your razor (or can't pack your safety razor in your carry-on), disposables can bail you out, but their cost is hard to justify for regular use; $2,400 can get you 10 years' worth of disposable razors, or a week in Aruba -- your call. Cheaper disposables, as noted, are available, but users say the cheapest disposables can leave your face a nicked-up, razor-bumpy mess.