I host all my domains through Network Solutions. I hadn’t logged in, in a while and when I updated my credit card information – a domain that I wanted to let expire, auto-renewed.
Network Solutions, as usual, was great about it – they cancelled the renewal and refunded my card. Most importantly though, you CAN’T turn off auto-renewal once it is enabled!
Well, I ended up finding that you can – it’s not just an advertised link: