This is about a free service from a commercial web site. You do not have to by anything nor do you even have to register with them.

Here is the scenario:
You want to crte a new web site with a cool idea you have. You maybe already have a web site, but you think the new idea needs a new name.

Checking around, you find that most of the cool ideas Thu have are already taken. But there are some possibility of using maybe a vanity kind of TLD. The TLD is the last part of a domain name, the part after the last dot. EXAMPLES:
geek9pm.net
geek9pm.club
geek9pm.us
In each of the above, the TLD is,respectfully, NET, CLUB and US.
In my cas, the geek9pm.com is held by somebody else, so I cant have it unless I pay him a lot of money. So I have to use another TLD to find the name I want.

Now you got the idea.
Where can anybody buy a name with a alternative TLD and not pay alto of money.

Some of alternative TLD options are very pricey.

Examples:
.com $ 9.20Low price, but cool names are take already
.info $ 12.29 Used to be the cheapest, price has gone up
.mobi $ 19.50 Do more letters mean none money?
.site $ 24.99
.cc $ 37.39 COCOS Islands.
.tv $ 39.95 Tuvalu, where is it?
.xxx $ 99.95 Who WOULD pay that much?

Boy do they vary! But how do yum find a reasonable price? Sometimes they have promos and specials. On company sells a nice TLD for under $1 and then if you renew it it will HOST over $50 after the first year. No thanks!

Now here is my recommendation. Not fora certain company, but rather for a service. It is a web site that gives you the information need:

https://tld-list.com/

They have a huge data base with $ price info an most TLD and registrars that offer such. With that data you can make a choice about which registrar you should start with for a specific TLD. The first year and renewal varies a lot.

I decided on three different registrars for my domain names s experiments. But you choice will be different from mine. Take a look at the service offered by that site. It is free to look at. Just don't buy anything.