Coupon is TESTANDCODE
I had already used it before realising it was one or the other, honestly its one of the better TLD’s IMO, too bad Cloudflare doesn’t support it yet.
Edit: I should have mentioned, you have to make a tentative payment of 1 USD, which is reverted.
Which are honestly some of the cheapest in the market, plus you own the domain and have the right to transfer it out, only paying the new registrar for a renewal after 60 days.
Hopefully CloudFlare add .dev & .app in the next year, given Google’s decision, I still can’t believe Squarespace is getting all those accounts.