Valyrian Steel Razors
Valyrian Steel Razors don't come with any replacement blades, and have none available to purchase. Because the blades attached to their respective iconic Game of Thrones weapon hilts never dull. And maybe also the cats who forged the set of Valyrian Steel Razors are hoping whoever buys them only shaves as often as Jorah Mormont, Jon Snow, and Jaime Lannister, and they won't get much use anyway.
Quite the lot there to mug for grooming supplies, 'eh?
According to Firebox, the reason we've been bestowed with Valyrian Steel Razors now, thousands of years after the Doom of Valyria, and a few worlds away from Westeros, is that while no new Valyrian steel swords have emerged since the cataclysmic event, "nobody said razors were off the table." Yeah, so it's a "Valyrian steel razor" like it's a "Damascus steel knife."
Razor handles are fashioned after 5 different Game of Thrones hilts: Jorah Mormont's Heartsbane; the Lannister-reforged Oathkeeper and Widow's Wail; Jon Snow's Longclaw; and a special golden switchblade modeled after Arya's dagger.
Oh and one more thing: if you try to buy a Valyrian Steel Razor, you'll probably come away as disappointed and pissed off as you are with Season 8 of Game of Thrones.