I have a piece of work that I'm helping someone with, in regards to a DDNS script for OpenWRT and making it compatible with Cloudflare DNS.

I need to be able to register a cheap domain that has a double TLD i.e. .xx.xx or .xxx.xx

this domain will only be used during testing, and will just be left to expire afterwards, so not wanting to spend much. just hoping theres likes a $1-$2 deal going somewhere :)