Why do you want to buy? Magic money tree? Ain't no such thing.
Bitcoin laundering? A bit advanced for newbieland. look it up later
So you want to know if its worth it? Look away now for the faint of heart!
Go here http://www.coinish.com/calc fill in your hash rate, purchase cost, plenty of other things to play with.
Select Expert Mode and check your "Break even considering reduction"
Still want to buy? Great, plenty of sellers on ebay or our Custom Hardware threads.
Enjoy suckers
Why so ironic? Fear the competition cause your BFL ain't shippin yet!? Well, it may take a while... Just kiddin...