Gandi appears to still allow registration of them: https://www.gandi.net/en/domain/tld/su https://www.gandi.net/en/domain/tld/su. I didn't actually register on

Gandi appears to still allow registration of them: https://www.gandi.net/en/domain/tld/su https://www.gandi.net/en/domain/tld/su. I didn't actually register one, but they quoted a price of $28.31 for the first year then $63.98/year afterwards.