It expires at Midnight EST so you have a few hours left
I just tried it and it works.
If the code doesn't work on the right "join" box you have to put in the "Redeem Promotion" once your inside after you fill out the first sign-up box on the right
The code is: Esport10 (I tried it, and asked CS before I tried and it's legit)
Apparently these are affiliate codes though because some other guy had a different from the one that I got.
Oh, before I signed up, CS said it's only for North American first time sign-ups.
But you get $10 instant
This is what they sent me after I used the code:
Dear Rebel,
Congratulations, you have just redeemed your promotion $10 Free Bet with the promotion code "ESPORT10 "! If the promotion code was for Contest Points, here are the next steps to winning...
- In the Sportsbook, select your preferred League/Sport from the left and then click the Line(s) you want from the middle.
- In the Bet Slip, select Straight or Parlay, then enter the Amount and choose Balance: Contest.
- Check-out the leadersboard regularly to see who's winning. and losing.
- Tell everyone that you won. Make fun of those that didn't.
You can view all your redeemed promotion codes and the leaderboard at any time by simply logging-in and going to Promotions then selecting History on the left.