I can answer this one for you. I have one web hosting account, and own 4 domains. All of these I pay one price: $9.95 per/month.

www.expo300.com
www.expo300.net
www.gamecocklanes.com
www.sandpiperlanes.com

Please note, I already owned the domain names, so I just added them to my account. I do believe you have to purchase the domains, then change the nameservers, then just add them to your account...

__________________