Got mine with my friends at River Rock, and also a free clip necklace thingy. You get a gold-coloured Gold card. My friends that got it through Edgewater got a blue Gold card and didn't get the necklace.
At RRock we also got this "Buy $5 in slots, get $10" coupon each. When we went to redeem, they just gave us $5 cash each! Free money ftw

My friend's gf didn't get one and when she complained at Guest Services, they gave her 2 coupons for her troubles. Chi-ching! Btw, my Edgewater friends did NOT get any coupons like this. So, make sure you get your card from RRock!
And the best part? We used that $ to win even more money at the tables that night.
Thanks OP for the tip!