I haven't seen this advertised anywhere but Daleroxxu posted it on his Facebook and it worked for me:
"Sickest promo on PokerStars.
Deposit $100 or more with bonus code 'SUNDAY8' for free a $55 sat ticket for Sunday's $8Million GTD Sunday Million"
Edit: fwiw it looks like you can't also get the $11 ticket that is more widely advertised if you do this, but obv this^ is better value
Edit #2: I got an e-mail about it from Stars now I looked at my "Promotions" inbox or w/e
I did the $11 one but didnt know theres a $55 one!
Whens that sat?