I have been using a 3 dollar/mo ipv6-only vps for a little while. It's not quite as user friendly and there are some challenges with not having an IPv4 address, but it's fine what I use it for.

I've used DO before and it's pretty convenient.

My ipv6 VPS gets scanned pretty frequently which was a bit of a surprise, just because it's way more work to scan ipv6 net blocks than ipv4 space.