Travis Konecny and Sidney Crosby during Game 3. Getty Images The Philadelphia Flyers will go for a sweep of the Pittsburgh Penguins on Saturday night, and Polymarket  is offering NY Post readers a $20 bonus with the  Polymarket promo code NYPMAX . Note that you will only get early access to the mobile app via the Polymarket invite code . Traders at Polymarket give the Penguins a 7-percent chance of coming back and winning the series. Pittsburgh was a favorite before the best-of-7 started. How the Polymarket promo code NYPMAX works Once you input the  Polymarket promo code   NYPMAX  during sign-up, you are eligible to receive a free $20 bonus after making your first deposit of $20. You can also skip the waitlist for instant access to the Polymarket mobile app by using the  Polymarket invite code NYPMAX : Deposit $20 to get a $20 bonus, with the  Polymarket promo code NYPMAX  to skip the waitlist. Where can I sign up for Polymarket?…