one web server, frequent new domains, easiest way to do SSL on all?

Hello

I have a webserver that gets a new domain + corresponding site every 3-4 months.

Is there any manageable way to set these up with SSL with out having to rely on a new IP address for each domain?

The only other option I can see is SNI but that's tied to the life span of the SSL cert and I think generating a new cert every few months is excessive.

Any one else have similar requirements, how do you deal with it?