I run a 30 team GM Style league going into our 9th year. We have two teams needing new owners before our rookie draft begins later this week. The league has a diverse range of participants form all over the country and we have unique and carefully curated rules that provide a very engaging GM experience.
The league is located here: http://pickandroll.proboards.com/
The two open teams are New York Knicks and the previously two time champion Kansas City Celtics.
Please check out the league and if you're interested register on the site and post in the League Check In which team you wish to take and I will provide you with further instructions. I go by TrailDucker in the league.