Question about Arduino nano

73 CHF? How is that even possible?! You can buy the same thing from Aliexpress for 4 CHF and it's identical! Even the original Arduino nano is less than 20 CHF, not 73! I can't fathom how can this possibly cost 73 CHF here, that's just insane! I've been using those boards in huge quantities for years, but I've never seen one so expensive!