RANKED: The Best Promos for the 2025 College Basketball Tournament

Update: This article has been updated to reflect the latest promo offers available as of March 26, 2025.

The 2024-25 College Basketball Tournament is rolling into the third round and the promos keep flowing.

Between our brand-new Dimers Pro sign-up offer and some brand-new sportsbook promos, including a pair of state launches, savvy bettors can secure hundreds of dollars in promo offers with a few small wagers.

If you're planning to bet on the College Basketball Tournament, then you'll want to be sure you have your full arsenal of elite data insights and the best sportsbooks at your side.

To help you  do so, we've compiled our favorite sportsbook sign-up offers across all the books and ranked them accordingly - if you don't have all these books, you could be looking at upwards of $2,000 worth of bonuses coming your way.

RANKED: The Top Promos for the College Basketball Tournament

1. Dimers Pro - Get 1 Month for the Price of 1 Week

To celebrate the biggest stretch of college hoops action all year, we’re giving new Dimers Pro subscribers a full month of access for the price of a single week—just $9.99. Simply use promo code MARCH at checkout to unlock this limited-time offer. 

Dimers Pro gives you unrivalled access to our best bets, player prop projections, tools, and more, all powered by our cutting-edge predictive analytics engine. With Pro, you’re not just betting—you’re betting smarter and the results speak for themselves.

But hurry—this deal is only available until April 7.

2. Bet365 IL and TN Launch Offer - Get $150 with $5 Bet OR Get Up to $1,000 Back

Newly launched in Illinois and Tennessee, Bet365 sportsbook has not one, but two sign-up offers for all new users to choose from. by using the bet365 bonus code "DIMERS" when you sign up.

Now active in 13 states, new users at bet365 can opt in to the "bet and get" style offer where they will receive $150 in bonus bets for their first $5 wager.

Here’s how you can activate this limited-time bonus bet deal:

1. Sign up for Bet365 using the bonus code "DIMERS."

2. Deposit at least $10 into your new account.

3. Bet $5 on any eligible event to unlock your bonus.

4. Once you’ve placed the bet, you’ll receive $150 in Bonus Bets: Redeemable for all sports for 7 days. Winnings from successful bonus bets can be withdrawn as cash or used to place additional wagers.

3. DraftKings - Get $200 With First $5 Bet

DraftKings Sportsbook has recently upgraded its promo code offer to provide $200 in bonus bets instantly. By signing up with this nationwide DraftKings promo code, depositing $5, and placing a $5 bet on game, you’ll unlock $200 in bonus bets to use across all sports.

Follow these steps to claim both offers:

1. Sign Up: Create a new DraftKings Sportsbook account using this upgraded DraftKings promo code.
2. Deposit $5 or More: A minimum deposit of $5 qualifies you for the bonus.
3. Place a $5 Qualifying Bet: Bet on any sport or event, such as a college basketball tournament game. Once your bet is placed, you’ll receive $200 in bonus bets instantly.

The bonus is credited as eight $25 single-use bets, valid for seven days.

4. FanDuel - Get $200 if Your First $5 Bet Wins

FanDuel has recently rolled out their latest promo code, offering $200 in bonus bets if your first $5 bet wins. By signing up with this nationwide FanDuel promo code, depositing $10, and placing a $5 bet on any game you can instantly unlock $200 in bonus bets to use on any sporting event.

For your $200 sign-up bonus, just follow these steps:

1. Sign up for FanDuel using this nationwide promo code link.
2. Deposit at least $5 into your FanDuel Sportsbook account.
3. Place a real-money wager of $5+ on any sport.
4. Win your bet, and you’ll receive $200 in Bonus Bets within 72 hours.

5. BetMGM - Get Up to $1,500 Back If Your First Bet Loses

BetMGM's offer is contingent upon the results of your first wager, rather than a "bet and get" style. If your first wager loses, you’ll receive a refund of up to $1,500 in bonus bets.

Activate this offer using this special $1,500 BetMGM bonus code link or by following the steps below:

1. Sign Up: Register for a BetMGM account using the bonus code “DIMERS″ or this $1,500 BetMGM promo link.
2. Deposit $10 or More: Make a minimum deposit of $10 to activate your bonus.
3. Place a Qualifying Bet: Bet at least $5 on any matchup to unlock first bet insurance up to $1,500.

Final Thoughts: Act Now to Claim Your Bonus Bets For the NCAAB Tournament!

No matter which sportsbook offers are available in your state, we recommend claiming each one you can to maximize your bankroll before the tournament ends on April 7.

Each promo offers additional excitement and big win potential as you bet on a variety of markets including, spreads, moneylines, totals, player props and more.

Responsible Gambling

Remember to please gamble responsibly. If you sense that you're taking your luck too far, know when to call it quits and don't be afraid to seek assistance. Keep in mind that gambling isall about having a fantastic experience! If you or someone you know is grappling with gambling issues, reach out to 1-800-GAMBLER for crisis counseling and support.