In 23 of its 24 states, Caesars's sign-up offer is: Bet $1, get 10 100% Profit Boosts up to $25 each. Promonyx estimates it is worth $150, and it needs about $1,460 available at once. Caesars's own site shows no promo code for it: the offer applies when you sign up.
Caesars's offer is checked in 24 states: Arizona, Colorado, Washington DC, Iowa, Illinois, Indiana, Kansas, Kentucky, Louisiana, Massachusetts, Maryland, Maine, Michigan, Missouri, North Carolina, New Jersey, Nevada, New York, Ohio, Pennsylvania, Tennessee, Virginia, West Virginia, Wyoming. One state group gets a different offer, listed below.
The book gives you boost tokens that raise the payout of a winning bet, each up to a cap. A boost pays only when the boosted bet wins, so its value comes from the cap and the odds it is used at.
About $150 on $1,460 of cash needed at once, a 10% return. That is an estimate of the offer before it is placed, based on the book's terms and prices at the time.