Yep.  The paintball tank.  A farmer in England got bored a while back, and turned a part of his farm into a paintball range.  Thinking bigger, he decided to make a paintball tank.  Teams work in threes, with a driver, a gunner, and a commander.  The tanks are modified, with fake guns, although they do shoot ping-pong balls filled with paint at up to 300mph.  Two Hours of tank warfare is only 74 pounds a head.  ($140 US).  Not cheap, but then again, its a real tank, with real weapons.

http://www.dailymail.co.uk/pages/live/articles/news/news.html?in_article_i
d=411993&in_page_id=1770&in_a_source