Secondlifeforum.com

Included:

Forum design
Domain name
vbseo licence
vbulletin owned licence

About 1200 uniques a month at the moment

Once build and put online but never did do much with it so decided to sell.

1150 USD

Going cheap as it is a potential trademark issue; for safety it is best to build the forum on another domain and use the domain for redirecting traffic only.