I think there are 3 ways to try to get a GC at this point:
1. Check The "Rewards" page or here weekly to see which days and times you can redeem your points for GCs. You are guaranteed a "shot" at redeeming for these-some people get in and get their GCs, others, like me, have yet to be successful at redeeming before the GCs are gone.
2. You can redeem your points for entries into the various contents throughout the site.
3. You can bid on an item using your points and hope that you are the high bidder.
HTH!