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New users can take advantage of the top NFL DFS promotions and odds boosts from sites like Underdog Fantasy, Sleeper, Betr, Pick6, Boom, ParlayPlay, Dabble and Playsqor on Sunday, Jan. 4, as NFL Week 18 brings a conclusion to the regular season. Several matchups could impact the NFL playoff picture, but none more so than Ravens vs. Steelers on 'Sunday Night Football' as the winner takes the AFC North and heads to the playoffs, while the loser is eliminated. Stars like Puka Nacua, Derrick Henry, Travis Kelce and Amon-Ra St. Brown are among the options for NFL prop picks throughout the day. Here's a look at some of the top NFL promo codes for parlay sites like Underdog FantasySleeper and ParlayPlay on Sunday:

Promos for Underdog Fantasy, Betr, Boom, ParlayPlay, Sleeper, Pick6, Dabble, Playsqor

Here's a look at the promo codes being offered by best DFS apps like Underdog Fantasy, Sleeper and ParlayPlay.

SiteBonus Offer  Promo Code
Underdog FantasyPlay $5, Get $75CBSPORTS2
Sleeper100% deposit match up to $100CBSSPORTS
ParlayPlay100% deposit match up to $100 + a $5 entry ticketCBSSPORTS
betr$10 in Betr Bucks and 50% up to $200 deposit match CBSSPORTS
Boom Fantasy$100 first entry refundJust click here
DraftKings Pick6New players play $5 on first paid entry, get $50 in Pick6 creditsJust click here
DabbleNew users get $25 in site creditCBSDAB
Playsqor100% deposit match up to $100CBSSPORTS

Top DFS app picks for Jan. 4

One of the top NFL prop picks at Underdog Fantasy is Lamar Jackson going higher than 210.5 passing yards in the winner-take-all matchup against the Steelers. Jackson (back) does not carry an injury designation for this game, clearing the way for his return after missing last week. SportsLine's model is projecting 245 passing yards, helping this number clear by more than 30 yards. 

At Betr, one of the top picks is Bears wide receiver D.J. Moore to go higher than 35.5 receiving yards. A win gives Chicago the No. 2 spot in the NFC and two guaranteed home games if the Bears advance that far. Chicago is planning to play starters against the Lions, and Moore is projected by SportsLine's model to have 48.3 yards.

Betr: Get $10 in Betr Bucks upon registration and 50% up to $200 deposit match 

Click here and use the promo code CBSSPORTS to get $10 in Betr Bucks upon registration and 50% up to $200 deposit match with the latest Betr Picks promo code.

Boom Fantasy: $100 First entry refund

New users can click here and get a risk-free entry up to $100 in Boom Fantasy bonus funds if your pick loses with the latest Boom Fantasy promo code.

DraftKings Pick6: Play $5 on First Paid Entry, Get $50 in Pick6 Credits

New users can click here and make an initial play of $5 or more on first paid entry at DraftKings Pick6 and then get $50 credit in Pick6 credits with the latest DraftKings Pick6 promo code:

ParlayPlay: 100% deposit match up to $100 + a $5 entry ticket

Get started by clicking here, and get a first deposit match of up to $100 and a free $5 contest entry with the latest ParlayPlay promo code:

Sleeper: 100% deposit match up to $100

Click here and use the Sleeper bonus code CBSSPORTS to receive this bonus from Sleeper, which is offered in the form of site credits. 

Underdog Fantasy: Play $5, get $75 in bonus entries

Click here to get started using the Underdog Fantasy bonus code CBSSPORTS2, which offers new users $75 in bonus entries when they enter a $5 (or higher) contest. 

Dabble Fantasy: New users get $25 sign-up bonus

New users can click here and use the Dabble promo code CBSDAB to get a $25 bonus, which comes in the form of site credits.

Playsqor: 100% deposit match up to $100

Click here to use the Playsqor promo code CBSSPORTS, which gives new users a 100% deposit match up to $100.

Responsible gaming

Responsible gambling is taken very seriously across all contest sites. All provide the necessary resources and contact information if you or someone you know may have a gambling problem. The minimum age is 18 for these sites in most states, but it is 19 or older in Alabama and Nebraska and 21 or older in Massachusetts. 

Responsible gambling resources include the National Council for Problem Gambling (NCPG) and Gamblers Anonymous.

Be smart. Bet smart. Wager responsibly. Those in need of help can also call or text 1-800-GAMBLER (1-800-426-2537). Help is available 24 hours per day and seven days per week.