They paid about $50k for ch.at. I have a single letter country code domain (3 characters total, x.xx). There are still some single letter country code domains available to register, you could get one for under $1k USD if you want one.

Here’s a reseller with a variety: https://1-single-letter-domains.com/

These guys run a bunch of services on x.xx domains: https://o.ee/services/ like c.im, r.nf, p.lu.

There was a time that I owned a one letter domain with a two letter country code.

The cost was about 600 USD and was fun, but problematic as it failed to be accepted as valid email address on many websites.

I own vecs.ai and it's surprisingly hard to find buyers. Domains are really just Xoomer NFTs

There's plenty still available. I bought an unregistered one last year for zero markup. Which reminds me, it needs renewing today.

I have a few, only bought on open market.

There are still quite a few XX.XX left, but mostly just under obscure cTLDs (unless you are willing to consider IDN/Unicode domains under .ws or similar)

i hold a good 2 letter Chat domain: hi.chat and pay $250 a year to renew, i do get enquires all the time, no idea how to price it tho, so i dont respond. Anyone have any ideas how to go about evaluating it?

I mean, ch.at is a incredible domain hack. But not sure it's worth millions. If it was ch.com could get mid six figures and up. But either way absolutely amazing domain.

unless they are .com, nobody cares.