[doyoureallytnot]

While they do charge per address for the smallest account size, the Premium subscription includes a few for free and it's very cheap to add additional domains.

I use 6 domains with them; a few from the Premium tier and a few I added as extras. I also get my VPN through Proton and the whole thing costs less than 15USD per month.

As already mentioned in this thread, the interface to handle all this is fantastic too.