You can buy one of those TLD at registry website since they are public. Google treats those TLDs as generic TLDs. For your information, Google does not treat differently the TLD and .COM domain names. All the purchase links point to a British company to register TLDs. If you look for a TLD outside of the USA, it would not make sense to buy a European TLD from a US registry company. We excluded Domain TLDs located outside of the USA but owned by a US company.
.BET operated by Affilias PLC from Ireland | Buy a .BET domain
.BEST operated by BestTLD Pty Ltd in Australia | Buy a .best domain
.BIO operated by Affilias PLC from Ireland | buy a .BIO
.BLACK operated by Affilias PLC in Ireland
.BLUE operated by Affilias PLC in Ireland.
.CAM operated by AC Webconnecting Holding B.V. in the Netherlands
.FRL operated by FRL Registry B.V in the Netherlands
.EU operated by Eurid in Belgium | buy a .eu
.EUS operated by PuntuEus Fundazioa in Spain | Buy a .eus
.FUN operated by Radix from the United Arab Emirates | Buy a .fun
.KIWI operated by Dot Kiwi limited in New Zealand | Buy a kiwi
.INFO operated by Affilias PLC from Ireland | buy a .info
.LGBT operated by Affilias PLC from Ireland |
.LLC operated by Affilias PLC from Ireland |
.MOBI operated by Affilias PLC from Ireland | Buy a .mobi
.ONLINE operated by Radix from the United Arab emirates | Buy a .online
.SITE operated by Radix from the United Arab emirates | Buy a .site
.TECH operated by Radix from the United Arab Emirates | Buy a .tech
.ONL operated British I-REGISTRY Ltd in Germany | Buy a .onl at Crazydomains