Planetgames.us ($330 is asking price) Category:Free Flash games.
Site has an admin panel and is very easy to add games and descriptions. The site took me a good amount of time to code.
Just so you know some history on the site.
I don't want to rip you off on the site (I got ripped off when I bought it).
The site only gets about 2-15 visitors a day. (I have done nothing with advertising)
When I orgionally bought the site, I paid $320 for it because it had a great template and sounded like it had a lot of visitors (then someone told me that template was ripped off and I could not use it and I found out the site had bearly any visitors.)
But now I redesigned it and it has a very nice admin interface and makes updating the site a breeze, I will teach you how to use it.
Just to let you know, the server the site will be hosted on needs this:
PHP, MYSQL, ability to password protect directories.