Free $100 Slips Bet Credit

https://slips.com –enter your phone number to make a Free Slips account. Then go to your profile page at this link, click promos, click add promo, and enter code: BOO100 to get $100 added to your account. This is also valid for existing accounts.
You may be able to use promo codes: PREDICT100 and HEADSUP100 as well.
Slips isn’t like a normal betting site, it’s all head to head, so you just place a various price bet against another group of people making the opposite bet, and if your team wins you win the bet. They also just added prediction market betting.