Tropics had a promotion, $10 free - just E-mail support for it. Don't know if it is still going on or not. I had opened my account last year and they still gave me the $10 about a month or so ago.
Pokerlover doesn't have a free $ giveaway but what they do have is continuous running $20 winner-take-all freeroll sit-n-go's. You can play until you win as long as there is a 20 minute break between the time you start a game and try to enter another. (if you lose). You can win only once a day but can win a maximum of 3 times ( for a $60 total) !!!!
A note of caution, the software isn't the greatest, don't sit in seat 2 or 3 as one of your hole cards disappears at times!!!!!