Starwood Preferred Guest - Need quick 600 points

SPG has been known to throw points around like water, especially under 1000. I'm 550 points short for an award stay. What is the quickest way besides AMEX to get these? Surveys? promos? I'll check with CC as well.

https://starwood.mpmvp.com/buy.asp

There's an opportunity on their website to earn 250 points for taking a survey